Many chargers sold in Australia aren’t suited for lithium batteries. Make sure yours supports lithium mode and recovery charging. Apply a low current to bring the battery up to at least 11V, so the BMS can re-engage. Disconnect the load and charger, wait 30 seconds, then reconnect the charger. This works on most smart BMS units.
It’s important to know that lithium only has bulk charging. It charges as much as possible, and when the battery is full, it stops. The Bulk charge will be set at 100% SOC. The battery will be charged until this voltage is reached. The float function for lead-acid batteries keeps the batteries topped up at a specific voltage.
LiFePO4 batteries exhibit a very flat voltage curve during discharge. This means the voltage remains relatively constant for most of the discharge cycle, providing a stable power output. The flat curve also makes it challenging to determine the exact state of charge (SOC) based solely on voltage.
For a 12V battery, a voltage under 10V is considered too low. For a 24V battery, voltages under 20V are considered too low. For a 48V battery, voltages under 40V are considered too low. What is the low voltage cutoff for 12V LiFePO4? The cutoff for a 12V battery is 10V. However, I recommend setting it to 12V, which equals 10%.
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