I want to try replacing a proprietary battery in an electronic of mine as a first electronics DIY project. Thing is, the stock battery is 3.6V, and the phone battery I have on hand that I would like to use is 3.8V. The replacement battery also has a charge voltage of 4.35V, and the AC adapter for the electronic is 5V. I've tried looking up if this will be a problem, but everything I've read is written waaayyyy beyond my skill level.
Are either a .2V difference in the batteries or a .65V difference between the battery and AC adapter significant differences that makes this build unsafe?
Also, is 24awg wire sufficient for wiring everything up? I would be soldering the replacement battery to the pcb inside of the proprietary battery.
Thanks in advance, and sorry for asking such basic questions.