Originally posted by Piotrek K Do you correct the voltage?
Concerned regarding damage from feeding the biggish 5v out of the powerbank directly into the Q as it seemed excessive beyond the 3.7v printed on the Q's battery label.
So my approach was to add a little 3.7v battery charging circuit that takes in a 5v input. Fits nicely into the otherwise empty dummy battery case. Turns out these charging cuircuits do not output at 3.7v but measures around 4.1v. However I settled for this being safe upon my further discovering 4.1v is very similar to what I see coming off a freshly fully charged Q battery.
Superficial tests indicates it works! Though I expect not very efficiently: inside the USB powerbank itself is a 3.7v 2200mAh 18650 lithium cell that feeds another circuit ramping its output up to 5v. That then feeds into my dummy battery charging circuit that drops the 5v back down to 4.1v...
I am seriously considering just wiring the Powerbank's 3.7v cell output (again around 4.1v fully charged) to the contacts of the dummy battery. What could go wrong!
Any input would be much appreciated.