Hi all, just wanna document the process and experience of 10000mah battery mod for the community 
My current setup:
CM5 16+64GB
HG AIO v2
HG NVME + Pouch battery version (pre-soldered jumper, using JST PH2.0 connector)
Aliexpress, Lishen 10000mah battery. 9858102 is the battery physical size.
Basic soldering iron, solder wire, flux
Modding process:
I bought some pre-crimped PH2.0 connectors from amazon, made my own connector.
These kits come with pre-crimped cables and metal inserts/connectors, and also housing for various pin counts. My kit also came with heat shrinking tubes. Neat.
The soldering process is easy:
- Cut the red wire from battery, cut a red crimped cable. Each should be around 6-8cm long.
1.5) Put the heat shrinkage tube on one side of the cable
- Make a married connection, then solder it. Check this tutorial for how to do it:
Then for soldering, just apply a generous amount of flux on the metal wires, then solder it. Make a saturated solder.
- Secure the heat shrinking tube, make sure that it cover the entire exposed metal parts, then let it shrink with a lighter or heat gun.
Repeat the same process for the other wire.
You should have at least 8-10cm wire length after this, so that you can install and reopen the backplate easily.
- Installing. The seat on the board is very very tight and you better use a pair of precision pliers (needle nose pliers) to send the connector Deeply into the seat.
If you face power related issues, it’s likely that you didn’t push the connector deep enough.
After this you just need to initiate the battery calibration and plug in, charge to full, then use to death, then charge to full again
Battery life:
I tested it with Welle.io (SDR based DAB FM radio listener), I can get around 4:20 of continuous listening time. Low screen brightness 4hrs, Screen off higher.
My CM5 is clocked at 2.2GHz max, when running Welle, it’s mostly staying at 1.6ghz. The maximum power draw currently is about 3amps. Average draw is about 1.8 - 2amps. The battery can handle that easily.
Again thanks to @vileer and @rex for making this possible.
PS, Welle.io is a great software for DAB maybe it can be added to the AIO package in the future?
