Battery Life Calculator

This calculator will help you to determine

How long a battery can power a given load or in other words what is the Battery life or Battery run time.
Rate of discharge of the battery in terms of “C” (capacity)
Recommended discharge rate based on the type of battery chemistry for optimum battery performance

Formulas:

Maximum duration a battery can power a load Battery life = Battery capacity ( mAh or Ah ) / Load current ( mA or A ) Rate at which load draws current from the battery Rate of discharge C = Load current ( mA or A ) / Battery capacity ( mAh or Ah ) Recommended rate of discharge for common battery types

Battery types	Recommended discharge rate
NiCd	1C
NiMh	0.5C
Li-ion	1C
Li-ion polymer	1C
Lead Acid	0.2C