Couple Questions

Im currently in the proces of building out my VR kit for fullbody tracking. Looking at my controllers, im also planing on getting them hooked up to the powersupply of my body trackers. Which brings me here:

• Does anyone have a pinout of the Testpads in the battery compartments so i could solder to there instead of the battery holder connections in the controller?
• If someone has atempted to solder directly onto the Battery clips, what is the Maximum safe voltage to feed in? 3V0 is expected from 2x 1.5V AA cells, but can it handle 3V3 or maybe even 5V?
• Is there a way to buy a pair (or if need be 2 pairs) of battery compartment covers?

To not have to drill up the only Battery compartment covers i have (and not needing to buy new controllers if i ever want to sell the headset)

Im not sure if i'm in the correct Subreddit or not. Or if the Support Flairtag is the correct one.

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Thanks for the answers if someone has any.

Have a good day