This is 1st time it has died on me. I charged it last week and used it for about an hour on thurs, fri and monday then it died. But when i have charged it the night before it lasts all day. Well if i work a 7 hour day i use it for 3.5 hours cos i only use it on upstairs. Much prefer it to trolley and i have tried the trolley as a van mount but i didnt like that either.