Battery Life Calculator

Estimate the total runtime of your battery based on capacity and consumption.

1. Battery Specs
Battery Capacity mAh
2. Consumption Load
Device Discharge mA
3. Efficiency Factor
Discharge Margin 85%

(Accounts for energy loss & safety buffer)

Estimated Total Runtime
21.25
Hours
0 Days
21 Hours
15 Mins

Battery Life Explained

The math behind battery life is simple in theory, but variables like temperature and internal resistance change things in the real world.

  • Capacity (mAh): Milliamp-hours. This represents how much "fuel" is in the tank. A 2500mAh battery can theoretically provide 2500mA of current for exactly 1 hour.
  • The Load (mA): This is how much power your device pulls. If your LED strip pulls 100mA, it will drain the "fuel" much slower than a motor pulling 1000mA.
  • The Efficiency/Safety Rule: Most battery chemistries (especially Li-Po and Lead Acid) should not be drained to 0% as it can permanently damage the cells. We use a safety factor (default 85%) to give you a realistic "safe" runtime estimate.
  • Formula: Runtime = (Capacity / Load) * Efficiency