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So new fact I learnt
Certain Exide "Maintenance Free" batteries have hidden caps to fill electrolytes
Seems the electrolyte they add is made to withstand like 2 years of use and then dry out, so the battery shop fella who I know for ages simply topped off the battery with normal distilled water, and said it will work longer, to add he had this battery tester there was an improvement before and after adding the electrolyte. The cells weren't even dry but level was bit above the electrode plates.