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informations are provided by the battery builtin firmware so you might want to do a deep charge to let the battery recalibrate. to do this drain entirely the battery and then (when the psp goes to sleep) continue restoring it till it doesn't power on anymore and try charging it back without using the psp. this should let the battery recalibrate and fix that problem (it isn't assured it will fix the maximum working time but at least you should have the correct percentual)
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