pandora help

[psp slim modd3r]

today i tried opening my sony psp slim battery to make it a pandora. i used an xacto knife to open it and when i started cutting along the edges there was a large spark and then a little fire inside of the battery. i do not know yet if this did any internal damage to my psp battery and if so i will need a new battery. i watched a video on how to open it up and i followed it and this happens. if anyone knows how to avoid this can you please tell me or if you could send me a pandora battery for me to use. thanks

[Lazyface]

dont cut at it just use a flat head and pry it up. Im guessing that it was a slim battery right

[psp slim modd3r]

yes it was a slim battery, i will try that when i get a new battery. thanks