battery sled

Not sure if this is the best place to post this but couldn't find anywhere better. I am not a modder by any means. My building stops at coils. But I just got a Tesla Invader Mini for really cheap and the batteries (dual 18650) are very difficult to remove. In case it's not obvious from the...

Battery sled is placed and all i could think is the negative terminal needs to be re-soldered or the mosfet is fried. Had to buy another battery sled it broke.