Match My Battery

Pulse drain and coin cells

Wireless bursts, motors and backlights can reveal limits that a simple capacity number hides.

Reviewed
2026-08-09
Sources
2
Reading time
4 minutes

Capacity is not the whole model

A coin cell’s useful capacity depends on drain rate, cutoff voltage, temperature and pulse size.

Internal resistance matters

Short high-current pulses create a temporary voltage drop. The device may reset even while energy remains in the cell.

Compare application data

Use the manufacturer’s discharge curves and the device’s minimum voltage rather than ranking cells by milliamp-hours alone.

Decision boundary

This guide narrows a battery decision but does not override the device manufacturer’s current manual or safety instructions.

Sources

  1. Energizer — Lithium Coin Handbook and Application Manual

    Lithium/manganese-dioxide coin chemistry, voltage, capacity, drain and application behavior.

  2. Energizer — CR1225 historical engineering drawing, Form EBC-4114D (marked OBSOLETE)

    Historical manufacturer drawing marked OBSOLETE, still served at this URL. Its dimensional envelope is a source-reading example, not a current production tolerance commitment, holder approval or device substitution.