I bought this battery for my 20v Black and Decker trimmer. It does not last more than 10 minutes. My original battery lasted for at least 30 minutes. Is there something I'm missing? It said that this battery would work with all 20v Black and Decker tools. I think it sucks!
Batteries come in different sizes (capacities). What was the capacity of your original battery, measured in amp hours (Ah)? This battery has quite a small capacity at 1.5Ah, probably one of the smallest capacities offered. That capacity determines the run time.