2012 Acura MDX 65,000 miles. Slightly over 3 years ago put in OEM Acura battery with 3 yr free replacement and 8 yr prorated. I would get about $90 towards a $155 OEM battery if it was defective just beyond 3 yrs.
Car wouldn't start. Fully charged battery--no go. Fully charged again and hand carried to Acura dealer. They did two tests and said battery was OK. It did fall short of some specs like CCA but no replacement offered.
I put Fluke multimeter on car and it showed parasitic drain of 275mA. Took it to Firestone. ASE certified mechanic in Electrical Systems said parasitic draw was OK at 40mA and battery was toast.
Bought an Interstate battery from Costco. Running for a month OK. Don't know why the parasitic draws are so different, it's a pretty simple test.
During this past month, resting battery voltage is usually between 12.5 and 12.7. Sitting quietly over a 24 hr period, it typically loses anywhere from 0.01 to 0.08. Is this a normal daily sitting loss, say about 0.04v?
If the daily voltage loss is normal, guess the mechanic was correct with the 40mA parasitic drain and for whatever reason, my Fluke is wrong at 275mA. BTW, I disconnect negative cable and put black lead on negative post and red lead on disconnected cable. Thanks.
Car wouldn't start. Fully charged battery--no go. Fully charged again and hand carried to Acura dealer. They did two tests and said battery was OK. It did fall short of some specs like CCA but no replacement offered.
I put Fluke multimeter on car and it showed parasitic drain of 275mA. Took it to Firestone. ASE certified mechanic in Electrical Systems said parasitic draw was OK at 40mA and battery was toast.
Bought an Interstate battery from Costco. Running for a month OK. Don't know why the parasitic draws are so different, it's a pretty simple test.
During this past month, resting battery voltage is usually between 12.5 and 12.7. Sitting quietly over a 24 hr period, it typically loses anywhere from 0.01 to 0.08. Is this a normal daily sitting loss, say about 0.04v?
If the daily voltage loss is normal, guess the mechanic was correct with the 40mA parasitic drain and for whatever reason, my Fluke is wrong at 275mA. BTW, I disconnect negative cable and put black lead on negative post and red lead on disconnected cable. Thanks.