GPD Win Battery Mod Upgrade 12000Mah

So I've dismantled a spare Antank battery case for Nintendo switch. Here is the case: https://www.amazon.com/Switch-Battery-Charger-Portable-6500mAh-Extended/dp/B07314ZP7L


As seen on screenshot it packs 6700mah at 3.7V.

It comes with a board and usb-C male connector. I was thinking of printing this mod Large Battery Case replacement for the GPD win.

See Large Battery Case for GPD Win: https://www.thingiverse.com/thing:2663665

I got 2 ideas on how to make it not sure which is okay and safe to do:

1) Can i directly wire positive and negative of this spare 3.7V 6500mah to the current stock battery of GPD win?

Although, the stock packs 3.8V 6700 mah

See image below:


Will that be okay charging wise and usage wise for the battery?

2) Another I could do is tap the usb-c cord/mini board of the gpd win 1 but that would mean adding the battery(spare) case board as well in the screenshot where i will use the usb-c male of the batter case(spare).

Not familiar with how battery works. Im just trying make a mod that beefs up gpd win longevity. Also back the GPD win 2. Hoping we can incorporate something similar to this.

Thanks!

Mail to: kendyz@gpd.hk

Finally got my newly printed 3d large battery mod case for gpd win



I got it from this guy. https://www.3dhubs.com/service/archgraphic

Highly recommended! You can order directly from 3hubs and ship it to you anywhere.