Hi everyone , i just made a simple battery mod with 4 Li Ion (18650) cells .
I just added 4 cells in parallel with the og battery , those cells are directly soldered the positive and negative of the og battery before the protection board .
The enclosure is 3d printed , i used 4 3100mah 18650 cells , a small voltmeter and a button .
So now i have a grand total of about 16,800mah of capicity , i got 10h on Zelda botw with mid brightness and wifi on ,and 23h on Terraria.
The device weight 620g with joycon , i can still dock it on my small dock and it also fit in my switch bag .
There is still one "bug" , the battery pourcentage on the system is slightly off , it sometimes says 1% but there is still plenty on battery and also says 100% of charge but the battery are still charging . (FIXED)
Thats why i added a voltmeter to see the real voltage of the battery and it works flawlessly now.


PS: sorry for my bad english , im french .
EDIT : It take 11h to charge from 0% to 100% the console.
The battery indicator is fixed until you completely charge it and discharge it about 15 times . like this --->(FIXED)
EDIT 2 : Its safe to mix different battery capacity if they have the same voltage when connecting them together , they are in parallel and you dont exceed the max C rating per cell. --->HERE
EDIT 3 : This is a proof to show that its possible and it works flawlessly , but i should have gone for two 18650 cells instead of 4 , 640g is heavy for some people and 16000 mah is overkill xD
I just added 4 cells in parallel with the og battery , those cells are directly soldered the positive and negative of the og battery before the protection board .
The enclosure is 3d printed , i used 4 3100mah 18650 cells , a small voltmeter and a button .
So now i have a grand total of about 16,800mah of capicity , i got 10h on Zelda botw with mid brightness and wifi on ,and 23h on Terraria.
The device weight 620g with joycon , i can still dock it on my small dock and it also fit in my switch bag .
There is still one "bug" , the battery pourcentage on the system is slightly off , it sometimes says 1% but there is still plenty on battery and also says 100% of charge but the battery are still charging . (FIXED)
Thats why i added a voltmeter to see the real voltage of the battery and it works flawlessly now.







PS: sorry for my bad english , im french .
EDIT : It take 11h to charge from 0% to 100% the console.
The battery indicator is fixed until you completely charge it and discharge it about 15 times . like this --->(FIXED)
EDIT 2 : Its safe to mix different battery capacity if they have the same voltage when connecting them together , they are in parallel and you dont exceed the max C rating per cell. --->HERE
EDIT 3 : This is a proof to show that its possible and it works flawlessly , but i should have gone for two 18650 cells instead of 4 , 640g is heavy for some people and 16000 mah is overkill xD
Last edited by Laytor,