I didn’t find a more suitable area, so I’m going to post here. The following question; I have two 4000mAh Power Bank here. Unfortunately, the charging socket of one device has a wobble contact. I can solder something, but not such small components. Therefore, I have thought about the following, I have two of these Power Banks. Would it be possible to take out the battery of one and pair it with the battery of the other? If it works what I would have imagined then I would have a Power Bank with 8’00 0mAh. Only makes the electronics of the Power Bank limp? How does the device know when the battery is full? The board in it is quite small, doesn’t look like a lot of electronics. On the Power Bank it says: Reinhard (NL) 1446WR-140NL. Item no.: 17735/600036 4000mAh Power Bank with Keychain Input: DC 5V 600mA Max Output: DV 5V 1A Max