I bought several years ago to me this drill. The NiCd battery has a long time no more power. Just bad. My neighbor has now given me his PSR960. Six months ago, I bought a non-original NiMH replacement battery with 3.3 Ah. Since the engine is running great. And now I still buy me a second replacement battery. So if you as a PSR960 calls his own, I recommend the battery to be replaced by a NiMH battery. Is still cheaper than a new cordless screwdriver.