It's very simple to get a new cell phone battery as long it's not an iPhone. Do a search for cell phone batteries online with your make and model in the search bar and you'll find plenty of offers. Make sure the battery is manufacturer recommended though.
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If your Pokemon game keeps restarting and is unable to save it means that the internal battery in the cartridge is dead. You can either replace the battery or buy a new game. If your interested in replacing the battery you need a CR2025 coin cell battery. They're about 5 bucks
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That's happening because you dropped your PSP or your battery is really old. Now to fix this just buy a brand new PSP battery after that it should be fine.
If your games stop saving, the only thing you can do is buy a new battery and replace the one inside the game cartridge. You can buy the replacement battery anywhere that sells a CR2025 battery or something similar. There's also some guides on the internet that show how to replace the battery. There is a chance of ruining the game if you're not careful, so do this at your own risk or ask something who good at doing things like this to replace it for you.
Ensure the device is switched off. Then, remove the battery cover. Remove the old battery from the device and replace it with a new one. Replace the cover and power back up to ensure the new battery is working.