never heard of a magic battery for de bricking psps untill reading this thread. i bet people will be pulling out bricked psps after reading this.
here are some pics of the magic battery.
http://psp-vault.com/images/justeaton/SonyUnbricker6.png[img]
Here's some specs on the battery, according to PSPGen:
# 1.1v-3.5v debug unit for connecting through the serial port in 3rd. battery pin.
# Transmission of data is UNENCRYPTED but uses a XOR algorithm for transmission (easily parsed and analyzed).
# Contains any number of IPLs (different ones for each motherboard revision (TA-XXX))
# IPL is loaded into the Kernel Memory. ME area seems most likely (IPL of the PSP is the same but missing 2 essential modules that the debug unit has).
# Contains ipl_mg_modules.bin and ipl_mg_nanddriver.bin
# IPL is encrypted in 3 stages. Easily decrypted to show stages, but not for decrypt each individual stage.
# Contains a 40x120 column TFT screen for display.
# Has a SERIAL port for PC connectivity.
# Seems to have a 32MB ROM IMAGE on Flash.
# 8MB of RAM.
# Nickel-Cadmium Battery Cell (possibly 76 hour battery life).
# AC/DC adapter port 15V.
# Contains 4 buttons (on/off, reset, connect/disconnect, menu).
# Arrow keys UP and DOWN for menu.