Did the watch start off after a full charge showing 100% on the battery meter, or was it showing less? And did you run that code while the Bangle was on charge, or when you'd taken it off? I guess it could be that the 'start voltage' that got set for your Bangle wasn't 100% correct.
This is what I get when graphing the battery voltage (blue) over time alongside the battery percent reported (red) when I've left the LCD backlight on to flatten it down. The graph stops when the Bangle runs out of battery completely
You can see the change in the blue line is tiny, and at least on my device I feel like I've done pretty much the best I can to get that line linear.
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