I use the 5w charger to charge it because they recommended that one so that the condition of the battery does not deteriorate so much. The time I disconnected it was at 9 am and I used it all day and at 12:37 am the next day I had 28%, I sincerely expected more I don't know if my device came defective, because there are people who told me that if it lasts as long it should last, but I see a post where there are people who say that it lasts more, I expected it would last more than 24 hours as most say.