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barrymagrec · 11th Aug 2018, 11:23 am

I have always assumed it refers to use of a hydrometer to test the specific gravity of a lead acid cell, a low or "flat" reading indicating a discharged cell - I could easily be wrong though.

11th Aug 2018, 11:23 am	#2
barrymagrec Octode Join Date: Dec 2017 Location: Morden, Surrey, UK. Posts: 1,559	Re: My battery is 'flat' ? I have always assumed it refers to use of a hydrometer to test the specific gravity of a lead acid cell, a low or "flat" reading indicating a discharged cell - I could easily be wrong though.