100Ah Group 31 Battery

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Group 31 batteries are an extremely popular BCI group size. It can be overwhelming as you attempt to compare and decide what is the best brand and style for your application. Generally speaking these batteries will range between 100 amp hour (Ah) and 125Ah, 600 cold cranking amps (CCA) and 1150 CCA and 150 reserve capacity (RC) and 230 RC. It depends on whether it is a thick plate deep cycle or thin plate stop/start battery or a dual purpose combination. The dimensions should be roughly 12.90 x 6.75 x 9.25 inches.

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The BCI Group 27 battery dimensions and specifications are very close to the 31's having the same width, but being slightly shorter in length and height. Typically the 27's will have 90 to 100Ah with a peak reserve capacity of around 190 for the best brands. At first glance you may think you own one instead of the other, so it is worth measuring your battery tray to confirm which battery you can truly fit.

We get asked a variation of this question fairly often, "should I get a group 31 AGM or a deep cycle group 31 battery?" It is a poorly formulated question asking us to compare different units of description that can partially describe the same item. AGM is the material used to create the battery and can be both deep cycle in nature and used in starting batteries.

The comparison would be between conventional lead acid and AGM or starting vs deep cycle.

Deep Cycle batteries will typically have the higher AH and RC levels. A great example of this type of battery is LifeLine. Starting or stop/go batteries will generally have higher CCA readings. Deep cycle batteries will have thicker plates whereas starting batteries will have thinner plates. Some batteries, such as NorthStar, can be a true dual purpose battery having high specifications in both categories.

If you are tired of getting the poor performing conventional marine or truck battery, it may be time to upgrade to a high performance battery by NorthStar or Lifeline.

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