Our goal is to bring high-quality service and products to our customers. We’re revolutionizing the renewable energy sector from the individual component to the end product, and are backing our industry-leading technology with unbeatable customer service. In an effort to make sustainable energy storage solutions more readily available, our Battle Born Batteries brand brings our same safe chemistry and reliable technology directly to consumers. We strive to be the most trusted and reliable source of lithium-ion battery technology and therefore commit to sharing our in-depth knowledge and understanding of the technology with our customers. In addition to being active in our own research and development, our engineers are constantly scouring the battery space for the latest lithium-ion battery technologies that will make a positive impact on our customers. Whether it is advancing our manufacturing and assembly processes or developing new, game-changing products our team continues to lead the way in innovation and reducing costs for the end-user. Our team is composed of battery experts that push for excellence with every new development. This allows us to offer customers a simple, fully-integrated battery system that makes tapping into renewable energy that much easier. We offer our battery technology directly to original equipment manufacturers (OEMs) such as Keystone Montana and Airstream. Our mission is to research, develop, and distribute the most advanced and fairly priced lithium batteries on the market. Energy storage has been the bottleneck of harnessing the unlimited potential of renewable energy, and we aim to change that. You may get multiple overvoltage BMS shutdowns along the way.At Dragonfly Energy, we are creating a new standard for energy storage. 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). high state of charge for extended periods of time. high temperatures for extended periods of time.My understanding is that the two primary causes of calendar aging (that is aging/degradtion independent of cycling) are:.As mentioned, it may be that charging to a higher voltage (~14.2-14.5ish) and letting the BMS balance the cells might have a positive effect. I see a few possible contributing factors. I would talk to BB and see what they have to say.
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