Sony DWT-B30 Digital Wireless Bodypack Transmitter (UC7: 470 to 616 MHz) - Manual (Page 19)

19
The battery discharges
quickly. The battery is not sufficiently charged. The battery will slowly discharge naturally, even
when the unit is not used. Fully charge the
battery.
If the remaining charge is not properly displayed
after fully charging the battery, the battery may
have reached the end of its life cycle. Use a new
battery pack.
The ambient temperature is extremely high or
extremely low. This is not a malfunction. Use the unit within the
allowable operating temperature range.
Symptom Cause Solution