If you used your battery has pandora battery than used the maker to restore and got the 0x47 write error (or 48 can't remember). The battery should work fine, but however if you get 100% and weird Hours left number like 100:29 (look at picture) all the time, than I'm here to tell you that it charges fine but you can't tell the battery life on your PSP.
I got 100% from battery information when I plugged in my ac. The battery icon was still flashing (Like it was charging). After awhile the % went down to 98 than 97%. My psp light turned Red to green.
I hope this means a full charge. If anyone has more information about there battery @ 100% and know any ideas on how to make it read the battery or tips on making a battery meter. Please, please post it in here
HERE IS A EXAMPLE: