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    1. · Premium Member
      2021 3500 Extended
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      850 Posts
      Have you load tested the battery yet? A static voltage reading can indicate a problem, but it may not indicate a bad cell that instantly fails under load. Jump it and drive it to Autozone/Oreillys/Advance for a free load test, or drop by HF and buy one:

      $20 well spent.....
       
    2. · Registered
      2015 Ram 2500 Promaster Diesel
      Joined
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      38 Posts
      Discussion Starter · #27 ·
      Have you load tested the battery yet? A static voltage reading can indicate a problem, but it may not indicate a bad cell that instantly fails under load. Jump it and drive it to Autozone/Oreillys/Advance for a free load test, or drop by HF and buy one:

      $20 well spent.....
      I will try that wasn't sure if I would make it there. I will give that a shot also. I believe they rent those testers so I can do that also possibly. Thanks
       
    1. · Registered
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      644 Posts
      A sulphated battery can appear to charge and even reach fully charged potential while charging, thus indicating 100% charged at some point, and even triggering maintenance mode on smart chargers. In order to really measure the true charge state of a lead acid battery (flooded or otherwise), a load has to be applied while voltage is measured. One of these will do the trick nicely: Tester



      And if a battery really must be relied upon (i.e. you can't afford to be stranded by an old battery on a trip), then measure the specific gravity of the electrolyte in each and every cell with one of these: Battery Hydrometer

       
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