Re: PL-380 Battery Problem
The Battery button, also the M button to the left of zero on the numeric keypad, may be the culprit. The draft manual on Yahoo Files > 3 Radios, Reviews, Manuals > Radio Manuals, page 15, tells how it works. Pressing and holding it with the power off turns charging on and off, and also tells the radio what type of cells you're using. It's possible you're using 1.2-V NiMH cells and it thinks you're using 1.5-V alkaline cells, and that the cells are dead.
Also possible that the connectors inside the radio are bent or slightly corroded. Someone else reported that problem with a PL-310. If you can snake a clean pencil eraser inside, it will wipe off corrosion.