JVC BH-VC20U Instructions Manual page 12

Note the following when using the charger and
rechargeable batteries:
Keep the charger terminals clean by wiping them
with a dry cloth. Be sure to disconnect the battery
charger from the power outlet before cleaning.
Batteries that have not been used for a long time do
not charge well. However, with regular use, the
batteries will return to normal.
If the batteries are not fully discharged before
recharging them, your Digital Still Camera's
operating time may decrease temporarily. If this
happens, discharge the batteries completely and
then charge them.
Rechargeable batteries wear out with repeated use.
As their capacity to hold a charge decreases, your
Digital Still Camera's operating time becomes
shorter. When the operating time gets too short, you
need to replace the batteries.
If the batteries are charged in a hot environment, or
if they are charged repeatedly without being
discharged, they will wear out more quickly.
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