How to use the Battery C-Rate Calculator
The Formula
C-rate = discharge current ÷ capacity (A ÷ Ah). 1C on a 100 Ah pack = 100 A and ~1 hour to empty. 0.5C = 50 A and ~2 hours.
Practical Example
High C-rates heat cells and reduce effective capacity. Check your battery datasheet for max continuous discharge.
About Battery C-Rate Calculator
C-rate formula
C-rate = discharge current ÷ capacity (A ÷ Ah). 1C on a 100 Ah pack = 100 A and ~1 hour to empty. 0.5C = 50 A and ~2 hours.
Why C-rate matters
High C-rates heat cells and reduce effective capacity. Check your battery datasheet for max continuous discharge.
Frequently asked questions
Q: Is this linear? A: Real packs sag under load—this is an ideal estimate. Q: What about Peukert? A: Lead-acid loses more capacity at high C; lithium is closer to linear for planning.