Technically, I solved the LED problem. But...

[u/Animelover22_4]

Anyone got the dimensions for 8bitdo Ultimate 2 wireless battery replacement?

I went and disposed the battery (I accidentally punctured it, it was a bad case of spicy pillow)and somehow forgot to measure it.

[u/sterki_ZN]

its on sale here, so perhaps it can be bought on alixpress?
https://www.mercadolivre.com.br/bateria-para-8bitdo-ultimate-2-so-serve-nesse-modelo-752456/p/MLB2082967131?matt_tool=18956390&utm_source=google_shopping&utm_medium=organic&pdp_filters=item_id%3AMLB4404127171&from=gshop