UPS with overcharge protection for external battery

From external battery overcharging

— the overcharge protection function prevents the accumulation of excess energy in the battery, from which the UPS operates in autonomous mode. Overcharging is highly undesirable for any type of battery. It can lead to various unpleasant consequences - from deterioration in performance to overheating and fire of the battery. The automatic protective equipment on board the uninterruptible power supply turns off the power after the battery is fully charged. This prevents “extra” current from entering the battery, which could damage it. This system is convenient in that the battery can be left on charge for a long time without fear of overexerting it.