Sorry if asking wrong people but I’ve got a samsung galaxy j3 prime, its a really old phone and i lost its charger a year ago, after that until now I was charging it with a different cheap charger, and one day eventually while using the phone the back cover fells of(it has removable back) and then i realised that the battery became swollen, I immediately took the battery out and kept the phone and battery apart for 2 months, now today I lost patience and grabbed a safety pin and did a little hole on both sides of the battery. Now it fits !!! and is much less swollen then before(yes it is still a little swollen)
So I meant to ask would it be safe to use it like that or is there a risk of the battery going kaboom!!! while i am using the phone or charging it ???
No no no no. Dump it in some salt water and kill it dead.
If you can put the old battery in it, you can put a new battery in it. It is absolutely not worth risking a fire for the sake of a few quid. Those batteries are very dangerous when damaged.
Do not leave it unattended until you locate a bucket and some salt to safely kill it. Do not put it in normal trash until and unless fully killed.