Battery charges, but green light only blinks once when turning on

Battery charges, but green light only blinks once when turning on

I have a Vita PCH-2001 that I bought off eBay for parts and repair and I’m trying to figure out what the issue might be. The orange light turns on when charging and turns off when the battery is fully charged, however when attempting to turn on the system I am greeted by the brief flash of a green light and nothing else.