What's the max battery voltage iPhone can handle?

/ scoopof3d
This time around iPower Pro disassembly. How does it work. Demo of my tools, and most importantly, what voltage damages the logic board?
Lets plug the logic board to power supply and find out.
For repairs visit iFixLogicBoards...
Music: HHD Trumpet, Easier to Fade (feat. Madi Larson) - A Himitsu
Screen stand: iPhone Screen JiG FundThatPart.com
Microscope: Amscope SM-4 amzn.to/2xHn9kA
LED: Amscope dual neck amzn.to/2xFmhbo
Leaded solder amzn.to/2yMxr2M
Desoldering wick amzn.to/2zqhfS6
Flux amzn.to/2ylZxPw
Side camera: Sony a6300 amzn.to/2xFNUAT
3D Stencil: amzn.to/2AwWIf4