https://www.ifixit.com/en-eu/products/sony-psp-e1000-replacement-battery
Sony PSP E1000 Replacement Battery
Replace a battery compatible with Sony PSP E1000 consoles. 3.7 Volts (V). 3.33 Watt Hours (Wh). 900 mAh.
sony pspe1000replacementbattery
https://www.ifixit.com/products/sony-psp-e1000-replacement-battery
Sony PSP E1000 Battery
Replace a battery compatible with Sony PSP E1000 consoles. 3.7 Volts (V). 3.33 Watt Hours (Wh). 900 mAh.
sony pspe1000battery
https://www.ifixit.com/Device/PSP_E1000
PSP E1000 Repair Help: Learn How to Fix It Yourself.
Find free step-by-step repair instructions, manuals, schematics, community support, and other DIY resources. You can do it! We show you how.
how to fix itpsp e1000repair helplearn
https://digiex.net/threads/psp-6-61-custom-firmware-install-on-any-psp-psp-psp-slim-psp-3000-psp-go-e1000.12915/
PSP 6.61 Custom Firmware Install on any PSP - PSP, PSP Slim, PSP 3000, PSP Go & E1000 | Digiex
The PSP Custom Firmware 6.61-Pro-C2 will work on all PSP models from the original PSP to the PSP Go and even the E1000, all you need is to be running...
https://digiex.net/threads/psp-6-61-custom-firmware-install-on-any-psp-psp-psp-slim-psp-3000-psp-go-e1000.12915/page-6
PSP 6.61 Custom Firmware Install on any PSP - PSP, PSP Slim, PSP 3000, PSP Go & E1000 | Page 6 |...
Do you get the recovery menu if you power the PSP on and hold down the right trigger?
https://digiex.net/threads/psp-6-61-custom-firmware-install-on-any-psp-psp-psp-slim-psp-3000-psp-go-e1000.12915/page-19
PSP 6.61 Custom Firmware Install on any PSP - PSP, PSP Slim, PSP 3000, PSP Go & E1000 | Page 19 |...
Yup basically, I upgraded to from an older CFW to the latest by doing as described.