What is the Battery Life Calculator?
Battery runtime depends on capacity and how much power your device uses. Enter the capacity (mAh or Ah), battery voltage and the load (in mA/A or watts). The tool applies a usable-capacity factor – lead-acid batteries should not be drained below ~50%, lithium to ~80–90% – and an inverter/converter efficiency to give a realistic runtime.
How to use the Battery Life Calculator
- Enter battery capacity and voltage.
- Enter the load current or power.
- Choose battery type and efficiency.
Formula
Runtime (h) = capacity (Ah) × voltage × usable % × efficiency ÷ load (W)
This Battery Life Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.
Last updated: · By NodifyTech