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Yesterday I bought myself a PSP to relive some of my childhood memories, run custom firmware on it and so on. Unfortunately however, the battery on this one is seriously puffed up, and I need one in order to update the firmware from 5.50 CFW (the seller actually modded it too!) to 6.61 OFW (to then install CFW from there again).
I figured that I might as well have a kick at disassembling the battery for good measure, to take out its controller and power it from my lab bench power supply. I set it to 3.70V, double-checked the connections.. nothing. I raised the voltage to 4V, still nothing.
There is absolutely nothing wrong with the controller from looking at it. The magic smoke is still in there, all I did was removing the housing and snipping off the battery. I measured the cell voltage and it was only some residues at 0.01V. Might be internally shorted or something, normally even dead cells settle back at 3.7V unless you keep them shorted externally.
After seeing this so many times now with controllers, I'm starting to get a feeling that manufacturers actually program these things to look at the battery voltage, and when it reaches 0V, to just make the controller kill itself. Doesn't matter if the controller's electronics are still good, just fucking kill it.
If true, that is very, VERY nasty. It would also explain why batteries in laptops especially all have different form factors, despite having used regular 18650's internally for a very long time. It would explain why they're built like tanks. It would explain why manufacturers really don't want people in there. Yes there are safety issues and you're literally diffusing a bomb. Since recently we've also got space optimization.. anything for half a mm of thickness, amirite? But doing it this way is fucking disgusting. There is absolutely no reason for the controller to kill itself when the cell dies. Yet it seems like it does.
PS: I've posted the original picture on https://ghnou.su/pics/... now if you're interested. I noticed in my previous rant that devRant really squishes these down.
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