lolz.. no noticeable improvement. but i'm looking forward whether it does improve lifespan of the battery.
so far my car clocked 51K km in 1.5 year.. according to some, maintenance free battery can last between 1 and 1.5 years only..

if my car's battery can last until 2 years above then it proves that it can make the battery last longer than usual.

and some reading in the internet, our car no need VS at all. current grounding is good already.
VS & extra grounding only for proton, perodua and cheap japanese car that assemble in malaysia (strip down version).. hahaha.. dunno how true this claim or not..