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First, I disconnected only the passenger's side (old one). The passenger's side tested at 760cca (same as posted above) and 12.89v. The driver's side measured 799cca and 12.63v.
Then, I reconnected the passenger's side and disconnected the driver's side. The passenger's side tested at 760cca again and 12.71v. The driver's side measured 940cca and 12.89v.
Can someone please explain the variation in cca of the driver's side battery, when days ago it measured 890cca while disconnected?
I was going to do a video on this but was missing some of the data so never did. I've not nailed down if it's the battery, or that this tester is not temperature compensated. Previously I tried testing batteries an hour after charging at Advance, then the next day and there was no change in capacity. So much for the "you can't check batteries right after charging". The batteries temperatures were relatively the same during all this.
December 16. 2016 I noticed high voltage drop during starting the Lincoln LS under damn cold temps. you know because the ECU gets all funky when there is a significant voltage drop at starter engagement. The vehicle was driven to Walmart to get its new battery. This is 10:42 am after putting in a new Walmart 850.
The journey of prove-out.
January 9, 2017 noon, I left the battery outside all this time. A slight variation of capacity, the driving charge dissipated.
January 12, 2017, the battery has been sitting in the utility room (tile floor and baseboard) for three days and brought up to room temp from the freezing temps it had been under. Approaching a 100cca change by temperature alone, no charge.
Confirming temp and voltage/capacity.
Setup the charger.
Hours later with charging in the cold weather, voltage is up but the capacity is dropping. I didn't record the battery temp, but it was in freezing weather so it had to drop.
Two hours later without any charge, the voltage is dropping, capacity is stable.
It may be with different testers they are voltage and temperature-dependent, or the batteries can be as well. I would need to play with that a lot more.
May just be superfluous. When I did the "That darn battery light" video I found resistance between the terminals and test clamps to be a factor.
Both times I tested the batteries it was morning before the truck was ever started and similar temps/weather conditions. Makes me doubt the accuracy of the tester.
By the way, your tester IS fancier than mine, it displays volts too. I have to use a multimeter for that.
Cleared out the P2614 and haven't heard from it since. Yesterday the Edge Evolution showed 9.8v for the first second at start-up, so I broke down and took the battery to Pepboys. Their test procedure gave it a failing mark, even though my less fancy Solar tester showed 749 CCA's, and it was still showing 12.89v at rest. Just goes to show those CCA testers aren't the end-all be-all for battery testing.
Also, I talked to Ed@ficmrepair today about what seemed like EVERYTHING , and he said most parts stores will replace both batteries if one goes bad. I asked about it at Pepboys and the guy looked at me like I was crazy.
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, and he said most parts stores will replace both batteries if one goes bad. I asked about it at Pepboys and the guy looked at me like I was crazy.
