Mine died about 2 weeks ago. Darn thing made me think I bricked my Thrill. I believe it has lasted about 3 months. I also expected longer life but for the cheep price I'm going to get another.
Given the nature of Li-ion. When they go bad its without warning and its flatline. I believe mine went bad cause a I had a few drops and rapid temperature changes. Batteries don't like that sort of thing.