How long will my RC battery last?
Divide usable battery capacity in amp-hours by average current draw in amps. Real runtime changes with driving style, gearing, terrain, and pack condition.
Live tool / power system
RC Run-Time Calculator
Estimate how long an RC battery pack may last from capacity, usable reserve, average draw, and an adjustable efficiency assumption.
Use this as a setup estimate
This tool treats the entered current as a motor-side average and applies the efficiency setting to estimate pack-side losses. Actual run time changes with driving style, terrain, gearing, battery condition, temperature, and your cutoff settings. Use your observed pack data to refine the current-draw assumption for your vehicle.
Setup reference
What this calculator does
Use pack capacity, a realistic reserve, and average amp draw to estimate RC battery run time before a heat or track session. The result is a planning baseline, not a replacement for checking pack voltage and temperature.
FAQ
RC setup questions
How much LiPo capacity should I use?
Keep a reserve rather than using the full rated capacity. A conservative usable-capacity setting helps protect the pack and makes the estimate more realistic.
Why does RC battery run time change between runs?
Throttle use, vehicle load, temperature, gearing, tire choice, and battery health all change average current draw.