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Battery Runtime and Duty Cycle Calculator

Estimate runtime from battery-side current or usable watt-hours with per-state losses, including sleep time, reserve and discharge conditions.

Use this result well

Inputs that matter
Battery pack and discharge conditions, Additional retained reserve (%), Usable pack capacity to cutoff (mAh), Complete battery-current cycle, and 3 more
Output to expect
Battery-side current and duty cycle, Battery energy and regulated loads
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Battery-side current and duty cycle

Estimate runtime from usable pack capacity and a complete repeating cycle of battery-side current measurements. Battery-side current already includes conversion losses and quiescent draw; do not multiply by another efficiency. Use representative measurements at the documented discharge conditions.

Average battery mA = Σ(state mA × state seconds) / cycle seconds; runtime hours = usable mAh × (1 − reserve / 100) / average mA.

Battery energy and regulated loads

Estimate runtime using available battery watt-hours and a complete repeating profile of regulated output watts. Conversion efficiency is specified for each state. Add only battery-side overhead that is excluded from that efficiency; otherwise enter zero to avoid counting losses twice.

State battery W = regulated W / (efficiency / 100) + separate battery W; average W is weighted by state duration; hours = available Wh after reserve / average W.

Updated: September 2026

Example Scenarios

Try the built-in example, then replace its source data with your actual documented values. Retain failed comparisons and unresolved decisions.

→ 152.542373 hours estimated runtime

Try the built-in example, then replace its source data with your actual documented values. Retain failed comparisons and unresolved decisions.

→ 91.937303 hours estimated runtime

FAQ

Estimate runtime from usable pack capacity and a complete repeating cycle of battery-side current measurements. Battery-side current already includes conversion losses and quiescent draw; do not multiply by another efficiency. Use representative measurements at the documented discharge conditions. Estimate runtime using available battery watt-hours and a complete repeating profile of regulated output watts. Conversion efficiency is specified for each state. Add only battery-side overhead that is excluded from that efficiency; otherwise enter zero to avoid counting losses twice.

Use the exact equipment, dimensions, current ratings, operating conditions and applicable requirements described in the selected mode. Unknown values are not replaced by a generic wire, device count or capacity. Illustrative examples are arithmetic examples, not an approved installation.

Save planning case keeps an explicit local history entry. Copy MD retains current inputs, source notes and interpretation; Download CSV exports the current result breakdown. Export a separate copy before changing devices or clearing browser storage.

About Battery Runtime and Duty Cycle Calculator

Estimate runtime from usable pack capacity and a complete repeating cycle of battery-side current measurements. Battery-side current already includes conversion losses and quiescent draw; do not multiply by another efficiency. Use representative measurements at the documented discharge conditions. Estimate runtime using available battery watt-hours and a complete repeating profile of regulated output watts. Conversion efficiency is specified for each state. Add only battery-side overhead that is excluded from that efficiency; otherwise enter zero to avoid counting losses twice.