Bought as a replacement for Craftsman cordless string trimmer. While the 'new' battery charges quickly, its charged life is much less than previous battery and charge quickly drains. It takes two charges to trim yard, and sometimes the second charge cannot be accomplished because the battery is 'too hot' to charge. I now do the front one day and the back the next, and that seems to work. Inconvenient work-around, but it beats shelling out $200+ for a new trimmer.See full review