Ok i fixed it, the solution was to charge the battery with an external power supply. None of the things mentioned in the original post worked but this one.
After charging it for a while i plugged the battery, switched it on and it lighted up, now it doesn't have an issue with turning on. Solved.
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Edit: this only charged the battery but not fixed the psp, check this: https://www.ifixit.com/Answers/View/884017/PSP+Go+-+Windows+doesn't+recognize+it,+and+no+charging.
Ok i fixed it, the solution was to charge the battery with an external power supply. None of the things mentioned in the original post worked but this one.
After charging it for a while i plugged the battery, switched it on and it lighted up, now it doesn't have an issue with turning on. Solved.