My ps vita won't turn on and only blinked once

I found my nephew ps vita, it was abandoned for a year. Then i charge it while blinked orange, then i waited ps logo change from blinked to steady. then, after 3-4 hours my ps vita won't getting full battery. i tried to turn it on but when i press the power button it only blinked once then going to steady orange even though i tried to enter recovery mode.

what should i do?