Replacing dead li-ion battery...

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The device in question is a PSP, feeling like playing some of the games again and on-the-go - smartphone games just don't have the quality

But being a 10 yo device means the batteries are all long gone. Those left on the shelves are pretty much non-serviceable. And the PSP likes its battery to have mAh.

So what are my options? Getting a similar-shaped li-ion polymer and stuffing it into the battery back?
 
Hey there,

the later versions of the PSP could be charged via the USB connector. If this is the case with your device, the easiest solution would be an external USB power bank - they are available cheaply with lots of mAh.

Regards,
Andreas

EDIT:

If you are familiar with delicate electronics stuff and safety measures, you might try to replace the batteries by newer Li-ion-cells. Technology has advanced and current production cells will probably be much smaller than the ones used in 2006. Depends however on how 'intelligent' the PSP battery pack is. If it contains the charge controller or some identifying electronics, it will be difficult to replace. You might be successful in replacing the cells only, but this requires some knowledge of the properties of the original cells.

Keep in mind that all Li-ion cells are potential firecrackers, capable of burning down your house or seriously injuring someone. Do not tinker with them unless you know very well what you are doing there.
 
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As Andreas mentions, you absolutely want to match like-for-like battery chemistry. So, as best you can, try to get as close to rated voltage as possible (I.e. avoid getting an LiFePO4 cell, among others). If you get figure out who the original cell manufacturer is, that should give you a much better idea what chemistry is being used.
 
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