Icom IC-F4200DEX Instructions Manual page 42

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BATTERY CHARGING
CAUTION: Shorter battery life could occur if the battery is left fully
charged, completely discharged, or in an excessive temperature
environment (above +50˚C; +122°F) for an extended period of time.
If the battery must be left unused for a long time, it must be de-
tached from the radio after discharging.
You may use the battery until the remaining capacity is about half,
then keep it safely in a cool dry place within the temperature range
as shown below:
–20˚C to +50˚C (–4°F to +122°F) (up to a month)
–20˚C to +40˚C (–4°F to +104°F) (up to three months)
–20˚C to +20˚C (–4°F to +68°F) (up to a year)
BE SURE to replace the battery with a new one after five years,
even if still holds a charge. The inside battery material will deterio-
rate after a period of time, even with little use.
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