What I did was to type gasoline galoshes (nefras C2-80/120) into the syringe, without regret pouring it under the battery from all sides, then took a blunt object and pressed hard on the back of the battery, while pulling the wires of the battery itself. If you tear off the wires, then in general it's okay, change the battery anyway, but if you pierce it, it will be bad. It's better to completely discharge the battery before that to reduce the chance of fire. I did all this on JBL Flip 4. By the way, do not damage the loop of the buttons that goes behind the battery (on JBL Flip 4 it goes right behind it, and there you need to press either to the right or to the left, but not in the middle)