I need help hytera pd785g

[elia]

Hello my beloved I am your brother from Iraq
The device is operated when using the power supply
It works properly but if we use the battery it works and then turns off
What is the problem

[shakalnokturn]

Possibly the battery itself? Often Lithium polymer pouch batteries will bulge as a sign they are defective.
With caution of short circuits, try running thin wires between the battery +/- terminals and transceiver, measure battery voltage while you operate the transceiver.