I still have to remove the remains of a battery from inside an Olight I3S EOS... it's at the stage where only a drill will save it.
No luck on my end as of yet, unfortunately.
You might have to use progressively large drill bits until there's not much battery left, then lever out the remains. But be careful not to drill too far in and damage anything.
Olight I3S EOS
I tried the freezer and momentum forces and pliers to no luck, thus far.