Whatever the case, the charger is detecting a problem and refusing to charge - and if it's a power tool battery, that probably means a totally dead cell group, which you can't fix, and trying to work ...

Ryobi is not exactly the Cadillac of cordless tools, but one still has certain expectations when buying a product. For most of us “don’t randomly stop working” is on the list. Ryobi 18-volt battery ...