Quote:
Originally Posted by Goran
My 110Ah Varta must have been truly toasted by the previous owner, only 2 years old according to purchase receipt, and it was draining to 12.2V after sitting for just 5 days after being fully charged. How easy/cheap is it to do a conductance test, just out of curiosity?
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not sure it is of great value to measure how much life is left in the battery , it either works for you or it doesn't , its a consumable product after all ; being a motorhomer [ with 3 batteries ] I am always watching them [ built in meter ]
on the A8 [ 95Ah 800CCA ] I have just fully charged the battery then disconnected the earth immediately and left for 2 days ; as you will all know a brand new battery will give you 12.7 volts but that doesn't last for more than a couple of weeks before it drops to something like 12.6 ; mine is reading 12.63 so I am more than happy with the amount of life remaining
with regard to drain tests I first used a clamp meter , but frankly I wasn't satisfied that it was sensitive enough which is why I sported £1 and made the resistor test lead
frankly goran I suspect you have had something draining the battery on both your cars ...searching around I found that top end mercs are renowned for a heavy draw but that 60mA would be pretty normal on one of those...I shall carry on looking , maybe you should sport £1 and do the same !
incidentally , if you give your 110 battery a long slow charge then leave it for a couple of days what sort of voltage do you get ...anything around 12.5v and it has a lot of life in it if you can reduce the draw !