if you are able to check the fluid level in the cells.your problems/procedures are what i went through when my battery was about the same age.not knowing enough to check the cells early on i was left with no alternative but to change the battery.at the end i did top off the cells but i think it was too little too late.another thing i didn't know of was different batteries.if i was to do it over again i would have replaced with optima providing it would fit

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'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'86 tbirdturbo(gone)
'85 mustang gt(gone-but not forgotten)