A couple weeks ago my 4 year old WalMart MAXX battery couldn’t turn over the van after I ran a Coleman cooler for about three hours. I easily jump started the vehicle with a small lawn and garden 12V battery I keep in the garage on a trickle charger.
After a couple weeks and some long trips I tested the van’s battery with a hygrometer. I did not read the actual specific gravities, but all the cells read in the red zone (not charged), some slightly in the red zone, some firmly in the red zone.
I drove to WalMart and they tested the battery today. Their device printed out a slip that said GOOD BATTERY; CCA 710 out of the rated 800; Voltage 12.67; Temperature 83 F.
The technician told me there’s no pro-rated warranty after the 3 year free replacement period is up on my May 2012 battery, but that their new batteries are better than mine, and have a 2-year pro-rated warrant after the initial 3 year free replacement period.
He told me they don’t use hygrometers nowadays because there are so many different varieties of plates and acids used in batteries, there would need to be many different hygrometers.
I remain skeptical. Meanwhile I am slow charging the battery and will have more data tomorrow.