Updating psp firmware without battery
Here are few tips to get it working: Memory Stick and load Hellcat’s Recovery Flasher. Then you will be asked if you want to reset your settings. Then it will start install Custom Firmware on your PSP.When it loads, choose I agree to the notice informing you that the program touches internal flash. When all done, press the X button and turn ON your PSP manually.
Because with a refresh PSP with a version 3.03 or above,you can run a lot more games and software applications without restriction on it.
But If you have a PSP 1000/2000 it’s possible to make the CFW permanent using CIPL_Flasher, if your model is not supported it will tell you so.
Create a folder on the root of the memory stick named “ISO”.
Input your desired settings again and enjoy 5.00 M33 on your PSP.
I have never charged the battery since I never needed it and that way it will be unused when I one day sell the laptop. Im not sure why you think the battery wont degrade when not used. And the fact that it has never been charged isnt going to help things. They only last two to three years, even if they are sitting on a shelf unused.