Bought a Walmart battery for $87 when my Interstate came up with a dead cell after 4 years into a 7 year battery. So I tested each cell of the Walmart battery with my battery hydrometer. Each cell tests at the high end of the "fair" section. 1.25 on the scale if that means anything to you guys. This battery has a 3 year exchange period if it fails, then 2 years gets prorated. Went to Advance and tested one of their batteries sitting on the shelf. Three cells tested 1.30 on the scale which is top of the "good" section. Tester says this is the best that it can be. Didn't bother to test the other 3 cells. Went back to Walmart and they won't exchange the battery. The battery starts my car great. I even checked it by turning on the brights (key on engine off) and checking the voltage drop (down to 12.2 volts) then came back up after 120 seconds to 12.6 volts. Both the Walmart battery and Advance are made by Johnson Controls. I also checked my 5 year old Walmart battery in my 1982 280zx turbo and it also tested 1.25 in all cells just like my brand new battery. I will call Johnson Controls Monday and see what they say. I just don't think my Walmart battery will last past the warranty period and if it does then the prorated amount will be minimal. Oh I also tested the battery in my friend's 2013 Ford Focus with 10k miles on it. All cells tested at 1.30 (top of the range). What do you guys think? This is the tester I used http://www.amazon.com/Golf-Cycle-Ba...916&sr=8-9&keywords=battery+tester+hydrometer
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