Was the battery replaced?

We bought 50 of these for our work... Probably within a month we had lost about 10 due to battery issues. I would strongly recommend not buying these, waste of money

how long is the battery life?

I have this item for a pretty specific use, so it is not getting hours of use at a time. That said, I have used it for about 4 hours on the one charge I have put on it, and it is above 50%. Hope this helps!