NiMH Battery Problem
From VAIO Library
On a lot of older VAIOs, there is a green NiMH cell, made up of several identical button cells. This cell leaks over time, and can destroy the motherboard through corrosion. We recommend removing this battery ASAP to prevent future leakage. (Guides will be available for VAIO models affected.) Sony used these batteries all the way up until the early 2010s, however there have been no documented cases of later VAIOs having leaking batteries.
Affected models:
PCG-C1 1st, 3rd and 4th gen
PCG-505
PCG-V505
PCG-R505/R600
PCG-F
PCG-GT1/GT3
.
Some VAIOs with a corroded NiMH cell do not power up with the battery installed but do power up with the battery removed.