Just now I got the boards. At work, I've quickly solder the battery witht it to charge fully. Today it charge the batterie with 500mA. 100mA is possible, too. But i will take to much time. I think about to integrate a switcher to have a option to change the mA from 100mA to 500mA.

Tonight my Jolla should be half full. Then I load again on to test if the battery is still OK.

After that I do with thoughts like I'm modding my LE TOH for it. Unfortunately I do not have a 3D printer.

I think about to install 3 mini switch
1) change the charging from 100mA to 500mA
2) cut the wire from charger to Batterie
3) cut the wire from batterie to Step-Up Booster

The Step-Up Booster has 1 red LED, the Charger self has 2 (green, red).
maybe I drill three extinguishers to the LEDs can also see from the outside.

but first one after the other