slim or phat?
what custom firmware?
You can hardware mod a battery to be a pandora,I've done 3.
Not for the faint of heart, you must not pop the silver bag or pack inside of the battery.Again many tutorials on youtube about it.Do you have the 1.50 kernel addon installed for your firmware(only phat)?
I may be slightly outdated in my info as I no longer have constant internet acess.Head to dax's webpage for everything you need.