Based on the previous success of adding ultra-fine carbon-PVA (polyvinyl al
cohol) colloid solution to restore performance of weak batteries, a large s
cale test programme of practical batteries including those used in forklift
, golf cart, taxi cab, truck and bus applications from 150 companies was ca
rried out. More than 95% of the tested batteries exhibited excellent recove
ry in performance parameters including the specific gravity (S.G,), voltage
and operation time (Ah capacity). The work reported here includes basic re
search studies to understand better the beneficial action of the carbon-PVA
colloid additive. (C) 1999 Elsevier Science S,A. All rights reserved.