How to use the Battery Charging Time
The Formula
Base time = capacity (mAh) ÷ charge current (mA). Adjust for efficiency: actual time = base time ÷ (efficiency ÷ 100).
Practical Example
Most chargers taper current above ~80% state of charge. Use a lower efficiency (85–95%) for a safer estimate, or pair with Solar Panel Size for off-grid planning.
About Battery Charging Time
Charging time formula
Base time = capacity (mAh) ÷ charge current (mA). Adjust for efficiency: actual time = base time ÷ (efficiency ÷ 100).
Why charging takes longer in practice
Most chargers taper current above ~80% state of charge. Use a lower efficiency (85–95%) for a safer estimate, or pair with Solar Panel Size for off-grid planning.