Implantable Electronics & Neurodevices calculator

Battery Life Estimate Calculator

Use this calculator to convert implantable battery capacity and average load into an estimated operating life. It helps teams compare stimulation programs, telemetry duty cycles, sleep current assumptions, and design margins before committing to a battery or power budget.

What this calculator does

  • Estimate implantable device battery runtime from usable capacity, average current draw, and design derating.
  • Use it when an engineer needs a quick runtime check for a neurostimulator, implantable sensor, cochlear implant module, or rechargeable implant operating mode.
  • The result estimates operating hours available from the battery under the entered average current load.

Formula used

  • Estimated battery runtime = usable battery capacity ÷ average implant current draw × battery capacity derating factor
  • Underrated runtime = usable battery capacity ÷ average implant current draw

Inputs explained

  • Usable battery capacity: Use the qualified usable capacity for the selected cell chemistry, discharge rate, and implant operating window.
  • Average implant current draw: Use the weighted average current across stimulation, sensing, telemetry, sleep, and housekeeping modes.
  • Battery capacity derating factor: Use 1.0 for no derating or a lower factor such as 0.8 when reserving capacity for aging, safety margin, or end-of-life limits.

How to use the result

  • Use it for early power budget reviews, stimulation program comparisons, battery sourcing discussions, and design margin checks.
  • It does not model pulse-by-pulse electrochemistry, temperature effects, self-discharge, recharge losses, shelf life, or regulatory lifetime claims.

Common questions

  • What is the battery life estimate calculator for? It estimates implantable device runtime from battery capacity and average current draw.
  • What information should I enter? Use qualified usable capacity in mAh, average implant current draw in mA, and a derating factor for margin or end-of-life reserve.
  • What does the result tell me? The result gives estimated runtime in hours, which can support battery selection, duty cycle review, and power budget tradeoffs.
  • When is the result only an estimate? It is only an estimate when current draw is modeled, patient use profiles vary, battery aging is not characterized, or recharge behavior is not included.

Last reviewed 2026-05-12.