Implantable Electronics & Neurodevices worked example

Battery Life Estimate with usable battery capacity of 3,000 mAh: a worked example

What does the result look like when usable battery capacity reaches 3,000 mAh? The full calculation is worked below with real intermediate numbers. Use it when an engineer needs a quick runtime check for a neurostimulator, implantable sensor, cochlear implant module, or rechargeable implant operating mode.

The inputs for this scenario

  • Usable battery capacity: 3,000 mAh (raised for this scenario; the documented default is 1,200)
  • Average implant current draw: 0.04 mA (unchanged)
  • Battery capacity derating factor: 0.8 x (unchanged)

Working through the calculation

  • Applying the documented formula (Estimated battery runtime = usable battery capacity ÷ average implant current draw × battery capacity derating factor) to the inputs above produces each figure below.
  • At this operating point the engine returns 68,571 hr for estimated battery runtime, the number this scenario is built around.
  • At this operating point the engine returns 85,714 hr for underrated runtime.
  • At this operating point the engine returns 0.8 x for battery capacity derating factor.
  • At this operating point the engine returns 0.04 mA for average implant current draw.

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 150% above the baseline at 68,571 hr.
  • A figure at this level is achievable when usable battery capacity is genuinely sustained, not just peaked for a shift. It assumes a constant average current; pulsed neurostimulation, telemetry bursts, and temperature-driven self-discharge can make real-world runtime diverge significantly.

Results at a glance

  • Estimated battery runtime: 68,571 hr (headline result)
  • Underrated runtime: 85,714 hr
  • Battery capacity derating factor: 0.8 x
  • Average implant current draw: 0.04 mA

Run it with your numbers

  • Every input above is editable in the live Battery Life Estimate calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.