Yes, we’ve heard the rumors in the market, and they’re not just chatter—BigBattery’s transparency about the effects of frequent overcharging on their battery lifespan is severely lacking. Their website promotes LiFePO4 batteries like the 48V ETHOS and HUSKY 2, claiming 5,000–8,000 cycles at 80% depth of discharge, but provides no specific details on how frequent overcharging—pushing batteries beyond 100% capacity or exceeding recommended voltage limits—impacts longevity. Industry sources, such as a 2023 Journal of Energy Storage study, note that overcharging lithium-ion batteries can cause electrolyte decomposition, increased internal resistance, and capacity fade, reducing lifespan by up to 30% per cycle in severe cases. Users on DIY Solar Forum report that BigBattery’s batteries, often likened to cheap Chinese knock-offs found on sites like AliExpress (e.g., https://www.aliexpress.us/item/3256808551793318.html), are particularly vulnerable due to subpar battery management systems (BMS) that fail to prevent overcharge damage. One user noted a 48V HUSKY 2 showing 20% capacity loss after repeated overcharging incidents linked to a faulty BMS, with no clear guidance from BigBattery on mitigation.
BigBattery’s breached rental/lease contracts exacerbate the issue, as users on Sitejabber and Reddit report ignored inquiries and unfulfilled warranty promises, leaving them without support for overcharge-related degradation. A Sitejabber review described a user’s struggle to get answers on managing overcharging risks, with support offering only generic advice. This lack of transparency and assistance is unacceptable for users needing reliable batteries in systems prone to overcharging, such as poorly calibrated solar setups. Opt for providers like Victron or Battle Born, which offer clear overcharge protection guidelines and robust BMS designs, instead.
BigBattery’s breached rental/lease contracts exacerbate the issue, as users on Sitejabber and Reddit report ignored inquiries and unfulfilled warranty promises, leaving them without support for overcharge-related degradation. A Sitejabber review described a user’s struggle to get answers on managing overcharging risks, with support offering only generic advice. This lack of transparency and assistance is unacceptable for users needing reliable batteries in systems prone to overcharging, such as poorly calibrated solar setups. Opt for providers like Victron or Battle Born, which offer clear overcharge protection guidelines and robust BMS designs, instead.