Has anyone tried out a hydralight fuel cell? 16.5 A, supportable by any individual battery, the better of the two in parallel. There are (legal) warnings on batteries concerning explosion hazards and acid corrosion burns, no warning advising users to keep battery charged. I would like to operate a 12 volt DC GPS device at the same time I am operating the boat. Let me get more specific. The game also has special attacks that can skip the next player’s turn, reverse the playing order, change the current card’s color, and deal damage to all the players at once. Hey, just wanted to say thanks! do batteries (ie 12 v) have to be the same CCA when used in parallel for instance using String A will have the (-) negative pole and string (B) will have the (+) pole I had a small 9V solar system with a battery bank. Here are my recommendations for the best rechargeable AA batteries: If you want the best energy capacity (2550 mAh) — get the Eneloop Pro (about $18 for pack of 4); If you want maximum recharge capacity (2100 times) — get the 4th Generation Panasonic Eneloops (about $11 for pack of 4); If you are on a budget don’t mind a little less performance from your batteries — get the … of course. Do you have 4 cells? If I have a 60ah vehicle battery that has 500 cranking amps and put it in parallel with another one, will the cranking amps increase to 1000? Motor torque is proportional is proportional to motor current. I.E. If they get out of step, they can be given an equalizing charge - a low amperage gassing charge to bring all the cells to 100% state of charge. After 5 years I have no problem with them, they are NOT in a box. Is must be work….no? Series or Parallel ? Larry, I have a hunting shack that I power with a 12v deep cycle battery. is this right,what is the side effect to the second working group,... For Ray : for an EV kart i have the option of 24, 3V cells at 120Ah in series giving me 72V and 120Ah, costing and weighing a considerable amount more than if i had 24, 3V cells of 40Ah connected in packs of 8 in parallel and 3 packs of the parallel batteries connected in series to give me less cost and weight for the same 72V and 120Ah. Nothing like a bit of common sense. Your 6Volt system will connect to one terminal of one battery and tap into the connection between both batteries. I have 2 x 12V 80Ah Batteries. Help Please. The top and bottom of your screen will turn orange when battery saver is turned on. please tell me is it right or not…. How can I determine the new state space equation? I checked the data seen of the battery and the diagram showing the discharging algorithm, what is allowed me to discharge the 2500mAh battery even with 5000mA for 1/2hour! connecting them in series is not an issue. System problems after battery replacement by MazdaOwner Oct 13, 2010 9:24AM PDT Had my battery replaced yesterday in a 2000 Mazda Protege, at a car parts store. infact second one gone bad totally then the first one. 1 and simple calculus of energy balance, PPV’s should deliver energy at least 8..9 hours / day, ... to have 4 cameras for full surround sight along with a reverse spoof switch to be able to see cameras while not in reverse. With a cell voltage of 1.2 V to 1.5V, this corresponds to 2 to 4 Wh per cell. the negative connected to the last battery & all in between open. What are the negative effects of connecting two 12v batteries, one 7ah and the other one 10ah, in parallel or series? Mike - If the only thing connected to the batteries is the lights, then opening the contacts of the light switch opens your electrical circuit. can someone tell me why the batteries work fine in a flashlight, but drain drastically when hooked directly to a 1000 lumens led bulb? Just add 2 wires and 2 clamps For the Series/Parallel Connection, I don’t think the math adds up. temporary, for example 2..3 in parallel (and 4 groups in series). How to setup fingerprint login in windows 10: 2) Select "sign-in options" to scroll to Windows Hello and click on "Settings" in the "Fingerprints" section. sires or parallel connection is use full? I want to ask if i can conect 2 of them in parallel and the third in series with the other 2? Let me guess. pls reply soon. the pack has one PCB which i think to protect the batteries during the charging and usage. You are connecting two AA CELLS. Golf Cart Solenoid | eBay I want to have a 50%DOD so i chose to connect two of this battery in parallel to get 48v/1200ah. Where do i turn? 1). Almost any 24V inverter accept 29,6V input voltage with no issues, at full have same voltage at the terminals, as far as possible,  without load and with test load, Conclusions: larger battery it’s better…and more costly. I sould ideally like to connect 20 or more to get 240VDC. are 11.1 volts and 6.6 amp hours apiece. I don’t work weekends…apologies. When i try to use a power drill that have specs( 220v,700 watts,3.1 amps.) I even tried to make 10V battery removing / shorting the defective cell and I learned it not worth to do this. If your dell fingerprint reader stopped working, try the troubleshooting provided in this article before send for repair to try to fix it. I have conducted the experiment using two power supplies it proved that the voltmeter shows the reading of 10 v.(higher voltage). (even If it were a 12Volt charging system, you would have an issue with one battery being charged more or less than the other.) 12vdc@ 2 amp draw for 5 or 6 hours equal 10~12 Ah. However, it’s only worth doing ideally if the batteries are of the same manufacturer and model…but same ratings will suffice providing it’s in good condition…assuming the original is also in good condition. I purchased a 1000 lumens led bulb for a radio controlled airplane. Appreciate your help, I have several batteries in a bank, all different producing 12 volts. 40..50A at 56..60V. I wonder you can help me in the below query. Second you do not say what you are running at each voltage. (28 coin cells of 3.5Ah, 3.7V Would a car voltage regulator for each battery be able to replace a solar charge controller? I think we may be able to assemble batteries with these flat cells that will save space. how do i create 52V 26AH battery and use what type of battery model for E-Scooter? Example: (2 AA’s in series) wired in parallel to (2 D’s in series) for a total of 3 volts and 14700 mAh, then the 2 AA’s would be inserted in the camera. A transistor, (probably an FET) switch with a permanent 50% on, 50% off duty. SImply wiring 4x 1.2v in parallel will give you the 4.8v you need. If you want a 480 Ah battery with 480A (!!) (I don’t see the everyday employees changing out the batteries as needed). The cellphone runs EMUI eight.zero, Huawei’s tackle the Android eight.zero Oreo operating system, and whereas it is OK, it is certainly not as clean and slick because the near-pure Android you’ll see on Moto’s phones. Batteries can be connected in series. Kinda n00b questions but we learn by civil answers…. The range and life for battery is affected by the Voltage disconnect of the controller, Batteries can be dangerous if you don’t know what you’re doing. Would the scenario be possible to 2s2p using 3 equal cells? Why does Pokémon Go rob so much Battery Power? They wired it and it worked. “A higher voltage has the advantage of keeping the conductor size small” is misapplied:  for a particular power output, higher voltages allow smaller current flows which in turn allow smaller conductors (ignoring start-up surges and increasing current draw as batteries lose voltage as they deplete). (capacita discharged from battery) = 20Wh : 12V = 1.66Ah and the bulbs will limit the current thru batteries. If not, how is the total charged energy distributed among all the cells? Heres my suggestion: I have installed off grid solar system at home. for UPS, high rate. Using this forum I found that it could be that the camera got damaged while replacing some parts, therefore I ordered a new camera, replaced it and it worked, great! Could I avoid such circumstances by making a battery pack to supply a higher voltage, such as an 18V Li ION or NiMH battery pack. the link is for their 384VDC 3 phase units. Would it help conserve power if I have a disconnect switch at the battery to stop leakage from wires when I turn the lights off at night? I know I had a 12VDC system with 5000W 12V inverter, supplied from 6 x2V 800AH POVs and it required 70mm squared cable to handle paek and spikes, Soalr is an investment and the wise man buys only once. A total short can occur through reverse polarization or dendrite growth. I also found it useful and full of good information. As I said at the beginning of my post, the two branches currents will be close, should not differ by more than 10%, let’s say 24A and 26A it sound OK for 50A charging. I appreciate the help of those that are much more knowledgeable about this than me. I think this is about the best you can do, and it’s my recommendation to either use 18650 or 26650 cells, but make sure your gauge wire can handle the amps without getting hot: 26650 Specs: 3.7v @ 5.2 Ah = 19.98wH My understanding of 4s5p is this diagram: represents the voltage & rated capacity of a component of the battery you are assembling (cells / smaler batteries). i have to to use a maximum of 48v, cell may be one or more then one, - Glad I just had a dead battery pack and a useless “Bag Phone”). Do not use summer-only tires in winter conditions, as it would adversely affect vehicle safety, performance and durability. If one cell fails, only the affected module is replaced. Or am I asking for a failure ? Same in a car battery they are rated @12V but require 14.4v Max to charged Do you have any temperature monitoring in place and are the batteries outdoor or indoor. We deliver between 9am and 6pm on weekdays, but not on weekends or bank holidays. Here are so many new things to learn and consider….. I have a Li-ion datasheet that says the max discharge for one cell is 2.2 A but the max discharge for the pack of 7 in series is 4.0 A. What is the best way to wire and do my setup so that I will not run out of power within the 9 hours of each day. My question here is how Li ions and electron or current flow works in this configuration ? Wow some people have no clue… For an electric vehicle, I am looking at Nissan Leaf Gen 2 batteries. 24,48, 96 are more common. It is also possible your inverter over-current protection is kicking in, causing the drill to struggle, in turn trying to draw more current. You say deep cycle is an abused buzzword. 9 Answers I had a new battery put in my CRV and now the radio/navigation/backup camera will not work. (As you found out, 12v is way too much.). (Not unlike a charging rack for portable radios or on-premise pagers or something.). Obviously connect the input to both batteries and connect the 12 volt output to the 12 volt winch. If that doesn’t work, restart your camera or doorbell again (see section 1, above). In addition to being a choking hazard, the current-flow of the battery can ulcerate the stomach wall if swallowed. I’m not sure if it will also use one battery then switch to the other if neither of them is charging. They get out of step. Thank you, Hi Djay Just look at how they series 2 x 12V to give 24V in a truck. There is no easy solution. Is there an Advantage/Limitation to connecting the Cells in the middle as well? Thanks again. life cycles will be ~ 60 and the charger is expensive. robbo. https://www.aliexpress.com/i/32828727983.html 4.8V   |+{===]-+{===]-+{===]|+{===]-| @2500ma cell capacity=7500 total (716) 725-8977 mobile. Disadvantages of lowvoltagestorage You’re looking at it the wrong way. @ Frederick I had some issues, especially when the standard switch used for 230 VAC has burned out at the disconnection of a 2 KW leaf blower. @ Veng: Chimole 3.5W 5V Solar Panel Charging For 18650 Rechargeable Battery+Solar Cell power bank Portable solar charger for Smart watch, https://www.aliexpress.com/item/3-5W-5V-Solar-Panel-Charging-For-18650-Rechargeable-Battery-Solar-Cell-power-bank-Portable/32812373464.html?src=google&albslr=225178492&isdl=y&aff_short_key=UneMJZVf&source;={ifdyn:dyn}{ifpla:pla}{ifdbm:DBM&albch=DID}&src=google&albch=shopping&acnt=494-037-6276&isdl=y&albcp=1001718710&albag=52375743834&slnk;=&trgt=349475913279&plac;=&crea=en32812373464&netw=g&device=c&mtctp;=&gclid=EAIaIQobChMIzNSg7bK42QIVxwgqCh1WvwTgEAQYASABEgK0WPD_BwE, It isalso available for under$12.00 from Steve if you are raising both voltage and mah you will need to run both in series and parallel. Help the me build a magic peop. Connecting 8 12V batteries for 24V charge and dual 24V and 96V outputs. Cheers, 1 . Pranabesh - if you understand what an ampere/hour is then you’ll understand what 7.2Ah means. There are no cells that can deliver 80,000 amps. Courtesy of Cadex. Try to delete the fingerprint data and enter the new fingerprint. Next time the rear view camera or the radio is not working check if the radio is showing signs of power being on. You will put 3 pcs. After studying the offers and prices, I realize that it’s difficult to find If you don't have a PIN, you'll need to create a PIN to set up the fingerprint reader.   Sure you can. Thanks. NabuN - Batteries/ battery cells on equalizing charge never develop the same voltage during or immediately upon completion. Since the DC voltage is not the same will the cd player get the same voltage of 55 v. Remove the bottom case. I haven’t actually done it. Once upon a time people knew that they didn’t know about electronics or electrical theory, now everyone just thinks they know enough apart from a few questions they might need to put on the internet. My company subcontracted to Exide to design, manufacture the automatic watering, gas filtering, flame arrestor equipment. Do not turn off your power plug when upgrading firmware. When I start putting batteries in parallel, of lets say 40Acont and 80Amax Discharge Rate, does putting batteries in parallel increase my Discharge Rate? Primary lithium batteries range between 3.0V and 3.9V. Not an endorsement, but I’d recommend EBL brand for the price and reliability. Charge methods. Alistair - The cell with the low SG is probably not going to survive much longer. I have an old SR5 Toyota as a beach bomb with a dead alternator thats $1200 to replace, so I charge it of the solar. Thanks. Short of switching individual batteries in and out of a system to accomplish this, is there a way to use a marine or automotive battery charger to directly charge the system? I’m pretty sure none of the batteries were backwards- they were standard Duracell 9V batteries.. What you have explained resonsates with me because I discovered last June that the solar array did not have sufficient power to put the solar battery charger into equalisation mode frequently because of the regular demand on the batteries. Any other useful information is very welcome. thanks Virian. I had experience of a large system that ran out of puff on days over 44C due to near melt down, Have a look at a Cat D9 battery box takes up the whole space under operators seat. Thank you very much! There is nowhere for the power to go. I can get one that change from 3, 5, 6, 8, 10, or 12. Most of the questioners here should not touch a battery until they’ve increased their knowledge a great deal. I bought mine used with 10k miles, it is a limited with the 12" Uconnect. worst case. i have a 5kw/48v solar inverter from I-PANDA that has different charging parameters including CC/CV with adjustable charging current so i decided on using a LiFePO4 48v/600ah battery from Hipower group china. We use a rapid battery charger hooked to a portable electric generator. My plan was to leave everything connected and just connect the pump on only one battery + and - as and when needed. In terms of battery life…the more batteries you have in parallel, the better. Since 2013, each year, 1…2 batteries, the oldest, had to be removed, which is quite normal, I think. Hello The voltage collapses and the device turns off with a “Low Battery” message. Installing 3 x 80a/h would supply 240a/h or nearly 3 times the capacity and distance. I would rather replace a $40 battery than pay a $200 service fee. Knowng that the batteries SHOULD have been OK in parallel, I am going to have to assume that there was a short that I didn’t notice. Often one battery is dead flat and others fully charged and are drawn down to the lowest voltage, If you have GOOD batteries hook them in series and buy a new inverter of that voltage, I did have a 6kw 12 V inverter (transformer type) running of 6x800Ah 2vPoe Batteries it worked well and could boil an electric jug in the morning. has anyone seen similar cases before. The answer is simple, chinese batteries are over valuated for some extra money…This is not right. A response would be greatly appreciated and I thank you in advance. The article then jumps to tips about household batteries without explaining the difference between primary and secondary batteries, nor this section’s relevance to the previous discussion. The specs are as follows: (The heater is not sensitive to voltage, it works well at 3 x 3.8V = 11.4V) The Li-SOCl2 batteries I’ve been looking at is at 3.6V with 35000mAh capacity and can give a maximum continuous current of 450mA. 10. Try to read carefully this page, from the beginning ! I want to give more current to a dc motor, but without burning the motor driver board. search hooking up many 6 or 12 v batteries simple wiring change keeps batteries balanced . The motor will make some noise but that does not matter. To power the camera made by Rohent, you have two choices: if you just use the camera to reserve, wire it to the reverse lights. hi sir for example if i have a 48 v ,6 A, 67.6 Ah and 26 cells in a battery pack how should i know that how many cells to be connected in series and in parallel combination. by 2 groups in parallel of 2 x 14.8 V 3000…3500 mAh 15c…25C (in series). 2: It sounds to me like one of those 2 li-ion batteries isn’t in as good a condition as the other, hence it’s lower post-drain voltage. BU-603: How to Calibrate a “Smart” Battery, BU-604: How to Process Data from a “Smart” Battery, BU-801: Setting Battery Performance Standards. I want to connect two of small cells in serial then connect with one of the big cells in parallel to form a bank cell with 1.2v and 300mA. Yes - but the batteries would likely not remain in balance due to unequal charging/ discharging.. hi With depressed operating voltage, this battery reaches the end-of-discharge point sooner than a normal pack. Wow, that got a little out of hand. The second option is to get DC /DC converters to do the job and again depending on the draw and budget, Keep me posted on how the diode thing progresses, Remember , need is the mother of creation. 4.8V   |+{===]-+{===]-+{===]-+{===]-| @2500ma cell capacity=5000 total The big Cats and Komatsus take a lot to kick over so they built a hand cart with solar panel as a jump starter kit with 24V @ 250Ah. What is your heaviest load The range is ~ 30Km, because I like speed when I hook the bulb up directly to two, non-rechargeable, 123a lithium batteries, the light shines brightly for a minute or two, and then the batteries discharge to a really weak state. Or Will it not work at all? If the boat has an onboard charging system (alternator, etc.) So as a matter of personal safety, I suggest you learn the basics of electricity before blowing something up and injuring yourself. the motor is energized at 42 volts with the 2 modules in parallel and a resistor in place, “Gear” 2 slightly faster and ‘torque’ still required to gain speed a 12V 55W car bulb with the two phases in parallel, for 10 ... 20 sec. In figure 3 and fig 4 , can charge it? Neel: There won’t be a backflow if the first is dead…but the circuit will try to charge it and balance them out. because of one defected battery in the second group & the non-ability to disconnect this group from the battery dis-connector.we will disconnect the battery only from the group & keep its circuit open.also open the loop in many another points . What WILL reduce wear, is using less watts from this battery, and keeping it as “full” as possible. what will be the total voltage when a 12v and 14v battery is connected in parallel, I,m charging a 12v battery with 14v supply..and i have connected a voltmeter across the terminal. I’m planning to further drain the voltage of both of the battery to 6.9 volt. both individually and then together? Would using 4 series NiMH be better? Power = Voltage * Current = 7.2V *6800mAh = 48.96Wh. In theory it should increase it to 1000A but due to losses it might be slightly less than this. (I remember being very alarmed, thinking that I could have blown up our bus or something) and ripped the battery pack apart immediately. So, you need a LiPo battery 3S1P - 3300 mAh or higher, like this (RC type, low cost): three 12v/32A batteries with two 12v/35Ah batteries all in parallel Observe polarity. i want to make a combination of battery for my Quadcopter (maximum 110amp current required for four motors) from these batteries i.e 2cell of 4200mah in series with 2 cell(parallel,becomes 4400mah;25C) of 2200mah battery. I’d like to know if there is a single cell battery that would be equivalent in size and voltage to a series stack-up of 4x AG3. This would theoretically provide me with a 1747.2watt battery pack. 1) One 5kVA RCT-axpert inverter, 48 VDC input, 220 VAC out. How? Taking into account inverter’s efficiency @ Yathisha I have connected two 6volt (155Ah) batteries together with a 12volt(100Ah) all in series. Interesting how I can pick up the wrong information, despite best research efforts. Of course, the power / energy absorbed from Hope this helps.. @nova & andrew : Regarding the electric field, if you are asking whether the electric field inside the batteries increase then i don’t think so, cause the voltage diff across the terminals of each cell remains the same (actually it will change slightly depending upon the voltage drop across the internal resistances of the cells).. Maybe smne from chemistry background can comment about this better, regarding what actually goes on inside the cell. i checked charger output voltage after disconnecting from battery and it is giving 25.50 v, charger is showing float charging and no alarms. To make all those starts seamless, the stop-start won’t kick in if it detects the battery is dying and it’s going to struggle to restart the car. If it did work at all, you’d see something less than 50V but more than 40V reaching the CD player. I notice that when fully charged it starts in a second, instantly. I’ve been learning a lot about battery chemistries… I’m leaning towards SLA, but NiCad or NiMh are close second choices. Thanks Daniel. Thanks. Do not carry loose cells in your pockets. A1) In series, always the weakest (smallest) element gives the battery’s capacity, in this case 3000 mAh. not taking into account of situations where all the other existing batteries are in good condition, good SGs and with plenty of life left in them? maximum rating current from these 6+6 batteries of 12V, you configure them in 2 groups in series, each group containing 6 batteries in parallel. It currently runs on a 300 mah, 3v lithium primary coin cell which gives a lifespan of two years. They will also possess slightly different self-discharge rates for the same reason. Trying to accomplish: add two 12v/35Ah batteries all in parallel to current bank (vendor did not have 32Ah batteries avail) Add one 100watts, 17.5v/6.5amps solar pannel also in parallel with current pannel & the same 12v/25amps charge controller. I’d say it was either a dodgy battery or 2 as you say, or perhaps just a partially discharged battery which would cause an offset in the balance of power between all the batteries in parallel. I Have 54 battery ( 2.2 volt and 250AH) connected in seri, and 15 of them are under 2 volten These welders give the amps but make sure it is regulated to 28.8V max, for a 24V string, PS a 54 piece battery bank is not all that common. For stationary applications I put only two batteries one of top of another, Sources: Apple is working on a magnetically attached battery pack for iPhone 12 that would wirelessly charge the handset — - Accessory has faced development issues related to software — Wireless charging unit may be popular with frequent users — Apple Inc. is working … By submitting this form, you are providing your express consent to receive electronic communications from Battery University and the Battery University Science and Technology email newsletter, powered by ArcaMax. my question is how would these be wired ?? I have charged the pack without the controlling board and cells seem to be fine. If you can't find it, then go to the support website to download the driver and install it. @NabuN thank you so much for taking your time to explain. On discharge, the weak cell empties first and gets hammered by the stronger brothers. If you install a second sett of batteries you would need a charging splittter as used in 4WD with twin batteries and a battery switch for A & B banks (it gets complicated ) so stick with the new80a/h batteries. New Zealand, @gogo: 3. Ulefone Note 9P's battery is powerful, the battery capacity is up to 4500mAh. We have 5.5 hours of Solar ideal sunlight per day. It is not about numbers but about battery characteristics. Give accurate and clear informations in your question to get a better answer. Do the continuous and max current ratings also go up and would it be 480 amps? Thank you. I have 4 cells of 18650 battery,,. Is it better to drain one deep cycle first than hook the next one up or hook both up at same time? The current capacity of a battery (ampere/hours) dictates how long said battery will last for with a given current being drawn from it. Most e-bikes come with 36V Li-ion, some are 48V. will it be worth wile to run 4 12 v batteries in parralel to get more amp hours out of the system? Some mild hybrid cars run on 48V Li-ion and use DC-DC conversion to 12V for the electrical system. salt and water powered battery? Although I replaced them all, rather than removing them all and then putting in new ones, I removed and replaced them one at a time. Mike. 2) Right click and select "Manage" to enter the "Device Manager". Thanks for creating this website. this will give the batteries a better life and if you intend to hook them to an El cheapo 12V inverter with a stepup transformer of 20 to 1 you will need all of 1,240AH to last a night.. Wiring…........you dont state the draw/discharge you require. Any questions? But with help I’m learning to build packs that are safe and work. please help me with this problems, 1)how i should connect those batteries with each other (parallel or in series?). B. Can I replace them with a 2400mah or greater for longer life? “The weakest element of the system will give the strength of the system”. Does it change the lines of electricity (electric field)? “Deep cycle” is an abused buzzword, making buyers think these can be completely discharged 1000’s of times, and that simply isn’t true. I would appreciate confirmation that I have understood crrectly. I have 3 Li batteries each of 3.7V 2600 mAH. The switching frequency can be a few hundred cycles. If one lithium battery at 12 volt has 100 amp recommended charge rate, does 2 of the same in parallel charged together have 200 amp charge rate? I have a 110V solar panel connected to 2 - 12V Diehard Platinum PM-1 deep cycle batteries through a regulator. Mike. i am trying to build a battery pack using the 6V Square lantern batteries. https://play.google.com/store/apps/details?id=pl.freshdata.batterypackagecalculator. I plan to increase capacity from 48V 200Ah to 48V 300 Ah in Series and Parallel combination and improve the power discharge REVA car consumes 3-4 KWh units of electricity every day. Edwin - No. 2. Can I take the leads from the three 12volt batteries in parallel while they are still hooked to the panels in series, and attach them to a 12 volt inverter? Furthermore, would this charger, if only charging, say one setup at a time, charge it faster or over-charge? thanks in advance! the batteries need to feed   11 kV AC bus and load is 200 MW. Why not a star installation?? external medium and reduce mechanical shocks. 1. Can I safely add 2 more batteries? Isn’t there a problem with connecting cells or batteries in parallel? People like me Who has a good job and no intentions to start school all over again needs a hobby. all cells will drop performances after certain cycles of charging and discharging. They used a 12v battery and after turning the lights on and off several times during the course of 10 minutes only one light worked. The first problem to overcome is how to charge 96V, that is 12x8 in series. Back up camera not working after new battery installed. Could I somehow use a 555 to create a pulse modification faster then the blinc of an eye? 2.Please don’t splice rear camera wire to extend by yourself, it will cause that there is no image of rear camera in the monitor, we have 23 feet rear camera extension cable sold separately. -__ __ __ __ + If a cell has Q comp. The testing will be with the li-ion placed at various points of the 6v wet-cell batteries (because that’s what I have to work with) to see if the delivery and sustainability of the batteries are accomplished, and if there’s a happy-medium to charge the hybrid battery. Sorry for my confusion. 5) There is a tight charging range to extend battery life. “The serial/parallel configuration shown in Figure 5 allows superior design flexibility” but also increases complexities of battery management and system troubleshooting immensely. If the capacity of A battery is lower than 85..90% of marked capacity (Ah) this solution don.t worth to be implemented, because battery A will soon be defective, like her “sister”, B. I admit a 0.1 ..0,2V unbalance between 12V batteries in float state.