Icom IC-F51 Instruction Manual page 46

5
BATTERY CHARGING
■ Caution
D Battery caution
CAUTION: DO NOT use the battery pack out of the specified tem-
perature range for the transceiver (–20˚C to +55˚C) and the pack
itself (–10˚C to +60˚C). Using the pack out of its specified tem-
perature range will reduce it's performance and the battery cell's
life. Please note that the specified temperature range of the pack
may exceed that of the transceiver. In such cases, the transceiver
may not work properly because it is out of its operating tempera-
ture range.
CAUTION: Shorter battery pack life could occur if the pack is left
fully charged, completely discharged, or in an excessive temper-
ature environment (above +45˚C) for an extended period of time.
If the battery pack must be left unused for a long time, it must be
detached from the transceiver after discharging. You may use the
pack until the remaining capacity is about half, then keep it safely in
a cool dry place in the following temperature range:
–20˚C to +45˚C (within a month)
–20˚C to +40˚C (within six months)
–20˚C to +35˚C (within a year)
BE SURE to replace the battery pack with a new one approxi-
mately five years after manufacturing, even if it still holds a charge.
The material inside the battery cells will become weak after a pe-
riod of time, even with little use. The estimated number of times
you can charge the pack is between 300 and 500. Even when the
pack appears to be fully charged, the operating time of the trans-
ceiver may become short when:
• Approximately five years have passed since the pack was man-
ufactured.
• The pack has been repeatedly charged.
37
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