Battery replacement

Hi looking for help. I am a newbie so be kind lol. My pi top laptop (slide down keyboard) battery died. Looking to replace,

I have a few batteries from other things that are good and are the right specs, so was looking to modify these for pi top. Like I seen in this video.

This is ok but I’d like to connect it to existing connection if possible and have new battery in same place under keyboard.

Has any body done this?, got any links to how connection that clips to battery is set up?. Can I buy a clip for to add to new battery so basically plug and play?.

As I said I’m a newbie so not up on the correct jargon for specific things but will get there lol.