The Garmin Forerunner 305 Heart Monitor uses a circular lithium battery (similar to the batteries used in garage door openers and automotive keyless entry remotes). The battery is designed for long life, but the precise replacement interval will vary depending on how often you use the monitor. Replacing the 305's battery is simple and only takes a few minutes. A replacement battery can be purchased from most electronics retailers. You can also order a replacement battery online. A pack containing several batteries usually costs less than £3.
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Things you need
- Replacement battery CR2032-3V
Turn the system over to find the circular battery cover (marked "CE").
Insert a small thin object, such as a coin, into the battery cover slot. Turn the object counter-clockwise to unscrew the cover.
Lift the battery out of its mount with your fingernail (don't poke or pry the battery out with a hard object because that could damage it).
Put the new battery in the battery compartment, with the positive sign (+) facing the circular battery cover.
Re-attach the circular battery cover. Use the coin to tighten the cover by turning it clockwise.
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