Check your fans I saved my battery today.

I went in to rotate the modules.
I did that.
More important I found the fan almost fully clogged. I didn't take any pictures.
I did get voltage and resistance readings for my records. These are my readings. Running good getting good 50mpg. Next I'm gonna make a balance cable to balance the battery without taking it out of the car.
01: 7.94v 5mΩ
02: 7.93v 10mΩ
03: 7.92v 4mΩ
04: 7.92v 5mΩ
05: 7.90v 5mΩ
06: 7.90v 8mΩ
07: 7.91v 5mΩ
08: 7.91v 5mΩ
09: 7.91v 3mΩ
10: 7.9v 5mΩ
11: 7.91v 4mΩ
12: 7.90v 5mΩ
13: 7.90v 8mΩ
14: 7.90v 10mΩ
15: 7.90v 5mΩ
16: 7.90v 5mΩ
17: 7.90v 4mΩ
18: 7.90v 5mΩ
19: 7.90v 5mΩ
20: 7.91v 3mΩ
21: 7.91v 5mΩ
22: 7.91v 8mΩ
23: 7.91v 6mΩ
24: 7.91v 4mΩ
25: 7.91v 5mΩ
26: 7.91v 5mΩ
27: 7.92v 5mΩ
28: 7.93v 8mΩ

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On this battery somewhere around 200k miles. The car has 399k miles on it. Couple of months ago I noticed a about 4-8 mpg drop. I hit it with prolong for a long time as I was trying to work out a noise I was having it went back up to 50+ mpg. So I decided to rotate as well. Now there is the result of my work thus far. I didn't do that before prolonged it. I had a bunch on my mind.
The battery is about 2.5 years old maybe more. Might be able to get the actual date from the dealer

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Looks like I'm in good shape there.

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Wow it says new condition with 200k on the battery. Almost 99%. I guess prolong works even tho voltages aren't super balanced.

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