The batteries on my older Vaio are both Sony. I'll dig that machine out tomorrow and delve into some of the Sony hidden software I've just discovered on the newer one I'm using. This 16" machine gobbles power, but does mean I don't have to dig out my LG monitor while I'm a guest in someone's house.
See t'other thread re gaining control of colour and auto brightness. I've cut this one back to 80% charge to prolong life. Rated by the self test at Good, but not excellent. It'll be interesting to see what such a test (if I can find it) says on the old machine.