We bought ours in February 22, and the battery is empty by 33% now. We had def. had some longer runs before and there was no issue using it for 2 weeks or even more. Now it is just frustrating because it shuts of, while displaying 1/3 of charge. I have now come up on this article and am considering to change the battery, as the service of these is very expensive. While the cost of a new battery is at max 5 euros.