Shutdown at approx. 26% battery

If HughB agrees, I will quote his answer in another Thread

HughB
There's a whole thread on this a while back, I'd have to look back to find it. About a month ago.
The battery usage as shown by % is not linear. The last 40% will shoot down in 1 day. The first 60% may take 3-20 days depending on what things you have configured.

The best is to think about charging your Bangle when you approach the 35/40%