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What is the Difference Between the Terminal Type F1 and F2?

F1 vs F2 Terminal Types


The F2 is 1/16" wider than the F1 terminal type.

Batteries come in all shapes and sizes. So do the battery terminals. Car batteries have cylinder posts, motorcycle batteries have square posts, some are threaded, others are simple tabs sticking straight out of the top of the case. The terminal types that are going to be discussed here are commonly found on Sealed Lead Acid (SLA) Batteries. These batteries are used in medical mobility wheelchairs, uninterrupted power systems (UPS), ride on toys for kids, razor scooters, and more.

The SLA batteries we sell, up to 12 volts 15 Amp Hours (AH), commonly use the faston tabs as the terminal type. The F1 and the F2 are the terms we use to refer to the terminals. At first glance, they look very similar. These are flat blade type terminals which stick up at an angle from the top or side of the battery. These terminal types are designed to be attached with a push-on spade insert, either for your application or for charging. The F1 terminal is thinner, and the F2 is wider.

F1 Terminal Tab

F2 Terminal


F1 Terminal Specs

The F1 Faston Tab is No. 187 because it is 0.187" wide. This is equivalent to 3/16" or 4.75 mm. If your application requires the larger, F2 terminal type, there are adapters available to attach to the F1 and make it compatible with F2 connectors.

F2 Terminal Specs

The F2 Faston Tab is No. 250 because it is 0.25" wide. That's 1/4" or 6.35 mm. The difference between the F1 and the F2 is only 1/16". That difference in width may appear to be miniscule, but if the application calls for one or the other, we recommend sticking to it. If you're not sure which one you need, a simple measurement will give you the answer.

F1 vs F2 Terminal Types

If you're looking for a battery with a specific terminal type, please look at our selection of SLA batteries. The terminal type will be listed right below the product specifications on the right sidebar. And if you need a battery specifically with one terminal type or the other, please give us a call at 541-474-4421 and our techs can help you find what you need, even if it means a special order battery with the either F1 or F2 terminals.

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7 Responses,   4.2 Rating

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  • great ! Very clear.

    Michele Van Saun
    June 26, 2016 a 2:33 pm
    • Excellent practical explanation on the differences between F terminals on a UPS. Thank you! P.S. I assumed that a rating of 5 is excellent.

      Edwin Barreto
      June 25, 2013 a 6:35 pm
      • Quick, succinct, understandable. Thank you. Having the web at our fingertips makes apparent how much we don‘t know and how much we can learn with a few key strokes.

        Kevin Bone
        July 6, 2013 a 8:20 am
        • nice articles

          Fake Uggs For Sale
          December 26, 2013 a 7:28 pm
          • Thank you very much for listing the different sizes in inches, mm, and decimal point. I could measure the differences in size, but looking for a good definition and found it here.

            Tiger PC
            March 31, 2014 a 1:03 pm
            • All sites should be as concise, complete and to the point. Explained difference , gave illustration and told me exactly how I could solve my problem. Well done!

              June 10, 2016 a 10:11 am
              • Excellent explanation, perfect level of detail – Thank you.

                Mary Lou
                December 4, 2014 a 9:47 am
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