Cameron Sino 900mAh Game Console Battery SP70C for Sony PSP E1000, PSP E1002, PSP E1004, PSP E1008, Pulse Wireless Headset 7.1|Digital Batteries| - AliExpress
How to Repair and Disassemble a PSP E1004 - YouTube
Sony Psp E1004 Screen & Battery Replacement - YouTube
Hack, Install Custom Firmware on Sony PSP-E1004 Street
High Quality Brand Battery 4-000-597-01 Lip1412 For Sony Psp Go Psp-n100 Psp-na1006 Replacement Battery 930mah 3.7v - Mobile Phone Batteries - AliExpress
PSP E1000 Repair - iFixit
Found this psp at a horrible goodwill and got it pretty cheap :) and the game is twisted metal head on, I plan on changing the shell to a clear one :
The PSP Model You (Probably) Don't Know About. | PSP Street / PSP - E1000 - YouTube