This piece of junk is meant to run for one year. They will then give you a 40% discount on a new one if you send them your old one back.
Here are a couple of video on guys that tore them up replacing the battery.
https://www.youtube.com/watch?v=k-BTStjaxgw
This one probably had a lot of finger blood on him when he finished.
https://www.youtube.com/watch?v=-TwBrauQJIA