Automobile Enthusiasts

The 4 year old battery is clocking its best readings in years. 12.5 volts, and 10.7 on the CCA test.

The 16 year old battery is clocking at 12.62 volts, and 9.7 on the CCA test.

I've ruled out parasitic draw ... the draw is 7.6 milliamps, which is negligible.

However, these batteries seem susceptible to draw down when connected to that 7.6ma draw overnight. I'm thinking that actually running these batteries for a good road test will get the deep CCA recharged.

The only thing that I changed was to clean the Battery Ground and reconnect with a film of dielectric grease. Must do this on the older car as well. And as I said I shook them vigorously side to side, and tilted 45 degrees in each direction. Online AI tells me that will help with sulfation, but on newer batteries that aren't made as strongly, it could crack the lead plates. So there's confirmation that they don't make them like they used to.

I was ready to replace them both. Had it all cued up online then decided to test.