![]() ![]() While I personally, and many people here share your preference for the DIY route, I think you are understating (or misunderstanding the value BB and companies like them provide). But totally understand if you would rather pay someone $500 to drop in $300 worth of batteries and BMS and sell it for $800. That is literally TWICE the Battery for half the price. Right now for 429.00 you can get (4) 3.2V 200aH LFP batteries plus busbar plus shipping (8-12 days) battery from the same country BB gets all their stuff. ti guess they drop it all in the box - and slap a sticker on it. The battery and the BMS - and probably the container is all from China. I do give you points for saying "assembled in USA" and not MADE IN USA. and they may get more and more picky about warranty issues BB will start dropping their price to keep up with consumer pricing. ALSO YOU have to ship the BB back and forth YOURSELF for warranty. ![]() Yes a 10 Year Warranty on paper - but lets see how long that actually lasts until allot of caveats begin to appear. BUT would love to hear BB explain how they can do something that NO other LFP manufacturer does. ![]() and yes - it takes about 24 hours to charge a 200aH battery that way. at work when our LFP batteries MUST be charged on emergency equipment below 32F we drop our 60A and 100A chargers down to less than 3A. MANY ppl have asked BB this and NEVER got a good answer. You may get multiple overvoltage BMS shutdowns along the way.The low temperature cutoff at 25F on the BattleBorns has never been proven to be safe - BB has NEVER told anyone how they are able to charge a chemistry that at 32F becomes bad. You have to continue to bulk voltage charge after BMS overvoltage clears to allow time for lower SOC cells to reach full charge. The battery BMS will continue to bleed overvoltage cell after overvoltage shutdown so the battery will eventually come into balance, just will take a lot longer time to wait for any overvoltage recoveries. More than about 1-2% out of balance is likely to give you a BMS cell overvoltage shutdown as you approach 14.4v with the highest SOC cell running up to overvoltage limit before lower SOC charge cells get near full charge. To put in perspective, if 100 mA balancing then it would take 10 hours to knock off 1 AH or 1% of 100 AH cell misbalance state of charge. (A 'cell' in Battle Born 12v battery is thirty 3.4 AH cylindrical cells in parallel with four of these groups in series) I am not sure what their BMS balancing current is but likely 100 mA, once a cell gets above 3.4v. The piece of info missing in attached video is the time necessary to hold 14.2 to 14.4v. ![]() But even at an accelerated rate, I couldn't imagine seeing the numbers you are seeingafter 3 years, at least with the lower capacity battery. It may be that if it was held there for years, in combination with being stored in higher temperatures for much of the year (am I correct in assuming you live in a hot climate?) calendar aging is occurring at an accelerated rate. On point 2, even though as others have alluded to, 13.4V is a totally reasonable float voltage, I think it is not a reasonable long term storage voltage if I'm understanding things correctly (I think 50% SOC +/- 20 is what you want for long term storage).
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