Parallel connection of two packs of same voltage but different capacities

hello, i have a question the answers to which i haven't been able find an answer.

let's say a bike (or electric skateboard) has a 12s5p as its main pack, let's say made up of LG HG2 cells.

now, let's say one wants to build an "extended" pack in a pelican case. this second pack would be in a 12s8p configuration, made up of Samsung 25r cells.

could one connect the extended pack to the main pack in parallel?

i know the discharge characteristics of the two packs would be different, but as they drift, wouldn't they also balance each other? would the rush of current from one pack to another degrade its life?

Short answer is yes.

Long answer is they have to be at (or very close to) the same voltage when you actually connect them together.


Further answers are in a few of the threads that come up in these searches:
https://endless-sphere.com/forums/search.php?keywords=parallel*+pack*+-series&terms=all&author=&sc=1&sf=titleonly&sr=topics&sk=t&sd=d&st=0&ch=300&t=0&submit=Search

https://endless-sphere.com/forums/search.php?keywords=parallel*+batt*+-series&terms=all&author=&sc=1&sf=titleonly&sr=topics&sk=t&sd=d&st=0&ch=300&t=0&submit=Search

fantastic, thanks for pointing me in the right direction.

I often ride differing AH packs in parallel using lipo and 18650 cells as mentioned if voltages are close then should be no problem, mostly the packs go down fairly linear to each other.