Translating step 6
The battery tray comes out, no problem.
The tray is held in place by only a few screws (yay!), but the battery is secured to the tray with pretty sticky adhesive (boo!).
The battery is rated at 3.8 V, 15 Wh, 3950 mAh, with a charging voltage of 4.35 V and is made by Celxpert Industrial.