Battery C-Rate Calculator

Calculate charge/discharge C-rate, time to full charge/discharge, and current draw from power demand.

Input Parameters

Results

--
Current Draw
A
--
C-Rate
C
--
Time to Empty
hrs
--
Max Rated Power
W
Note: 1C means full discharge in 1 hour. LiFePO4 typically supports 0.5-1C continuous, lead-acid 0.1-0.2C. High C-rates reduce effective capacity.

Reference

Current = Power / Voltage C-Rate = Current / Capacity (Ah) Time to Empty = Capacity / Current Max Power = Max C-Rate x Capacity x Voltage