( ( As ( ( the ( lead ( sulfate ( crystals form ) ) ) ) ( on ( the batteries ) ) ) ) ( , ( ( the battery ) ( ( depletes ( ( its reserve ) ( of ( electro-chemical energy ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN As) (NP (NP (DT the) (JJ lead) (JJ sulfate) (NNS crystals) (NN form)) (PP (IN on) (NP (DT the) (NNS batteries))))) (, ,) (NP (DT the) (NN battery)) (VP (VBZ depletes) (NP (NP (PRP$ its) (NN reserve)) (PP (IN of) (NP (JJ electro-chemical) (NN energy))))) (. .)))
As the lead sulfate crystals form on the batteries, the battery depletes its reserve of electro-chemical energy.
(ROOT (S (NP (JJ Lead) (NN sulfate)) (VP (VBZ is) (NP (NP (DT the) (JJ white) (JJ solid)) (SBAR (WHNP (WDT that)) (S (VP (VBZ forms) (PP (IN on) (NP (JJ corroded) (NN battery) (NNS terminals)))))))) (. .)))