Battery Charge Time
Provide the battery's capacity, the charger's output and an efficiency estimate to gauge the approximate charging duration.
Actual charge times vary with battery condition and charger design.
Examples
- 3000 mAh with 1000 mA at 90% ⇒ 3.33 h
- 2000 mAh with 500 mA at 85% ⇒ 4.71 h
- 4500 mAh with 1500 mA at 92% ⇒ 3.26 h
FAQ
Why include efficiency?
Charging isn't perfectly efficient; some energy is lost as heat or resistance.
Can I use different units?
Yes. Ensure capacity and current use the same base units (e.g., Ah and A).
How do I handle partial charges?
Multiply the result by the fraction of the battery you need to fill.
Does this handle fast charging?
It offers a rough average; fast chargers often taper current as the battery fills.
Additional Information
- Time is calculated as capacity ÷ (current × efficiency).
- Efficiency accounts for energy lost as heat; most chargers fall between 85–95%.