Kenwood ProTalk tk-3501 Quick Reference Manual page 15

Note:
When an abnormality occurs during charging, the indicator performs
◆
as follows:
Blinks Red: The battery pack is either defective or the battery pack
contacts are not properly mated with those of the charger.
Alternates Flashing Green and Orange: The battery pack has not
satisfied the charging start temperature. Remove the battery pack
from the charger and wait until it reaches a normal temperature before
charging it again.
The ambient temperature should be between 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.
While operating the transceiver using a Li-ion battery pack in areas
◆
of an ambient temperature of –10°C and lower, operating time may
be shortened.
Attention should be drawn to the environmental aspects of battery
◆
pack disposal.
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