Leixen UV-52 User Manual page 10

The battery pack life is over when its operating
time decreases even though it is fully and
correctly charged. Replace the battery pack.
Don't charge the battery pack if it is already fully
charged or it will short the life of the battery.
Don't charge the battery pack or radio while it is
wet. Please wipe up it first to avoid danger.
4. Please charge the battery pack as follow:
The 9V charger must be connected to the 220
volt AC mains via the transformer supplied.
Put the DC plug of the radio into the DC socket
of the charger unit.
Slide the battery or the radio with a battery pack
into the charger.
Make sure the battery pack contacts are in
contact with the charging terminals, and the
charger LED is on, it begins to charge.
After charging the supplied battery pack for 5
hours, the charger light turns to green
automatically after charging is completed.
Remove it or the radio equipped with it from the
charger.