Implantable Electronics & Neurodevices worked example

Battery Life Estimate with usable battery capacity of 600 mAh: a worked example

Suppose usable battery capacity falls to 600 mAh. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate implantable device battery runtime from usable capacity, average current draw, and design derating.

The inputs for this scenario

  • Usable battery capacity: 600 mAh (the input this scenario stresses; the baseline uses 1,200)
  • Average implant current draw: 0.04 mA (held at the documented default)
  • Battery capacity derating factor: 0.8 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Estimated battery runtime = usable battery capacity ÷ average implant current draw × battery capacity derating factor.
  • Estimated battery runtime works out to 13,714 hr at these inputs, and this is the headline figure for the scenario.
  • Underrated runtime works out to 17,143 hr at these inputs.
  • Battery capacity derating factor works out to 0.8 x at these inputs.
  • Average implant current draw works out to 0.04 mA at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where usable battery capacity sits at 1,200 mAh and the headline result is 27,429 hr, this scenario comes in 50% below the baseline at 13,714 hr.
  • It divides usable battery capacity by average current draw, then multiplies by a derating factor to give a realistic runtime in hours. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Estimated battery runtime: 13,714 hr (headline result)
  • Underrated runtime: 17,143 hr
  • Battery capacity derating factor: 0.8 x
  • Average implant current draw: 0.04 mA

Run it with your numbers

  • To rerun this with your own numbers, open the live Battery Life Estimate calculator, set usable battery capacity to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.