Kenwood TK-2200L Instruction Manual page 17

When charging is completed, the indicator lights green.
Remove the battery pack or the transceiver from the
charging slot of the charger.
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It takes approximately 3 hours to charge the battery pack.
When the charger will not be used for a long time, unplug the
AC adapter from the AC outlet.
Note:
◆ When the indicator blinks red, the battery pack is either defective
or the battery pack contacts are not properly mated with those of
the charger.
◆ The ambient temperature should be between 4°F and 04°F (5
°C and 40°C) while charging is in progress. Charging outside this
range may not fully charge the battery.
◆ The battery pack life is over when its operating time decreases
even though it is fully and correctly charged. Replace the battery
pack.
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