What is the minimum battery voltage level below which external power should not be connected?

The minimum battery voltage level below which external power should not be connected is critical for ensuring the safety and integrity of both the battery and the connected external power systems. When the voltage level drops below 22.0 volts, it indicates that the battery may be in a state that could lead to further damage or reduced performance if external power is applied.

Connecting external power when the battery voltage is too low can cause overcharging, which may lead to overheating, reduced life of the battery, or even potential failure. A voltage of 22.0 volts serves as a threshold, allowing for sufficient charge within the battery to manage any incoming power safely. Thus, this value is set as a standard to prevent issues that could arise from trying to charge a deeply discharged battery.

Higher voltage levels typically indicate either a fully charged battery or a safe threshold for charging without risk. Therefore, ensuring that the battery voltage is above 22.0 volts is a practice rooted in the preservation of battery health and overall system integrity.