B3121 - Lightweight AGM Battery (BACK ORDERED UNTIL 07/21/2021)

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Braille Battery

BRA B3121

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At 21 pounds, the B3121 is our lightest do eveything battery yet. Using our Advanced AGM racing technology we have put a lot of power into a very small package. With 1380 pulse cranking amps this has enough power to start more than any other battery in its weight class. This is the perfect model for those who want to shave half the weight of a standard Group 34 battery and still have enough power to crank over a steet car with V8 engine & standard compression. Used in everything from large Harley Davidsons to Hot Rods, road race cars, Corvettes & Vipers. (Note: while high in cranking amps, make sure battery has enough capacity for the vehicle intended to be used in.  Not designed for big block, high compression motors, those with no alternator, etc. where a full-size battery with high capacity is required.) 

Direct Replacement For:

YIX30L, YB30L-B, ETX30L, HD 66010-97

Common Upgrade For:

PC925 (same size, 5 pounds lighter, 50% more cranking power)


   Physical Specs
BCI Group All Sizes Width 5.2" / 132mm
21lbs / 9.5kg
Height 6.8" / 173mm
6.6" / 168mm
Polarity Right Side Positive


   Performance Specs
Full Voltage Charge  13.2
Pulse Cranking Amps (PCA) 1380 Amp Hour (AH)  31
Reserve Capacity 1hr 15 mins
Life Cycle (10%DOD)  3100

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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