Press release
Why Lithium-Ion Batteries Fail to Charge After Discharge: Roles of Battery Management System
First, identify the battery's discharge level when it can't charge. The first type is mild discharge: this triggers the over-discharge protection of the BMS. The BMS works normally here, cutting off the discharge MOSFET to stop power output. As a result, the battery can't discharge, and external devices may not detect its voltage. Charger type affects charging success: chargers with voltage identification need to detect external voltage to start charging, while those with activation functions can directly charge batteries under BMS over-discharge protection.
The second type is severe discharge: when the battery voltage drops to around 1-2 volts, the BMS chip fails to operate, causing low-voltage lockout. Replacing chargers won't help, but a solution exists: bypass the BMS to replenish power directly to the battery. However, this requires disassembling the battery, so non-professionals must exercise caution.
Image: https://www.dalybms.com/uploads/175e24918f98a4bfb3940347203e85652.jpg
Understanding these discharge states and the BMS's role helps users avoid unnecessary battery replacement. For long-term storage, charge lithium-ion batteries to 50%-70% and top up every 1-2 weeks-this prevents severe discharge and extends battery life.
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Country: China
Website: https://www.dalybms.com/
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