I'm using this with the chainsaw sharpener and can get through four chains (all I own!) and the display still shows a full charge. Think it could go for hours.
It worked a long time and was really surpised it lasted so long. Much better then have to have a plug to plug in or put gas into the item you want to use it with. Did over 2 hours of work with it and the battery still had 2 bars on it.(2 bar lights) Very happy with it.
Bought starter kit with trimmer. Loved the performance of both the tool and battery/charger. Battery has long useful life and charges quickly. Would recommend Einhell tools. They’re well made with metal gearing and quality metal parts.