Bangle.js2 E.getBattery() never reaches 100 %

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jgw
Hi,
I have an app user complaining about not being able 'to charge the Bangle.js 2 to 100%'.
After some testing with 3 Bangles, I must conclude he's right : the 3 parts report 93..95 % after one day of charging.

One of those units outputs values as follows :
```
>process.version
="2v10.89"
>E.getBattery()
=94
>NRF.getBattery()
=3.28623046874
> 
```
(I studied Espruino's 'jswrap_bangle.c', but there I see low and high values of 0.246V and 0.32V, which I don't understand.)

So my question : is there a better way to detect the 'end-of-charge' condition ?

(I know I can cheat and introduce a correction factor for the 'E.getBattery' result, but...)

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