Unrivaled Customer Service
And Expert Tech Advice!  
Same Day Shipping Before 11 PM ET
My Cart
Shop By Vehicle
Shop By
Close Menu
Shop By Vehicle
Top Categories
All Categories

Top Categories

All Categories

Free Catalog
E-Mail Signup
My Account
Track Order
Gift Certificates

Braille Battery Carbon Fiber Racing Battery 21 lbs

Braille Battery B3121C


made in usa
jegs shipping
FREE Shipping
Estimated to ship directly from the manufacturer on 09/20/18
Easy Returns
Easy Returns
Lowest Price Guarantee
Lowest Price Guarantee
Braille Battery Carbon Fiber Racing Battery 21 lbs $374.99
Carbon Fiber Racing Battery
  • 21 lbs
  • 6.6" L x 5.2" W x 6.8" H
  • Cold Cranking Amps: 550
  • Pulse Cranking Amps: 1380
  • Right Side Positive

  • Braille Battery B3121C Details

    Carbon Fiber Racing Batteries

    Braille Batteries are used by racers all over the world in the NASCAR, FIA WRC, FIA Formula Racing, Speed World Challenge Series, SCCA ProRally Series, SCCA Regional and National Racing, NASA Touring Cars, NIRA, NOPI and Battle of the Imports Drag Racing Series. Braille Batteries are also designed for deep-cycle use in premium vehicles with enhanced reliability and performance.

    Seeing a need for a Braille Battery that had extended reserve time and amp hour capacity, Braille changed the internal grid structure to suit customers looking for the highest amp hour to weight ratio for an AGM battery. The Spec 147-B3121C is perfect for daily street use, even in colder climates. Braille developed the 147-B3121C to excel at competition use and in situations where the battery is relied on to perform at a higher level than other batteries. This includes extreme audio systems and insane motors.

    The 147-B3121C features an industry leading energy to weight ratio. Enhanced Mat Technology (more surface area on the lead plates) combined with calcium full frame power path grids (increase cranking power), yields over 1300 Pulse Cranking Amps. With a weight of only 21 pounds/9.5kg, the 147-B2015c is 10-30 pounds lighter than a standard battery of equal power. It also has a very high reserve time of over 1he 15 minutes to ensure the power to start even after using the vehicles accessories.

    Durability was also designed into this battery. Using high density oxide, Braille was able to offer a battery with true deep-cycling ability over the life of the battery. Heavy duty vibration resistant power posts resist cracking and deterioration common to many lightweight batteries used in harsh automotive environments. The 147-B3121C is a sealed unit that can be mounted in any position safely using its adjustable automotive terminal posts.

    Voltage: 12 volts
    Full Charge Voltage: 13.8 volts
    Short Circuit Current (Max Cranking Amps): 3000
    Pulse Cranking Amps (PCA) 5 sec @ 80F: 1380
    Pulse Cranking Amps (PCA) 10 sec @ 80F: 1207
    Pulse Cranking Amps (PCA) 20 sec @ 80F: 1066
    Cranking Amps 30 sec @ 80F: 892
    Cranking Amps 30 sec @ 32F: 742
    Cold Cranking Amps 30 sec @ 0F: 550
    Reserve Capacity: 1 hr & 15 minutes
    Capacity (C/20 rate): 31 amp hr
    Internal Resistance (ohms): 4 milliohms (.004ohms)
    Life Cycle @ 10% DOD: Up to 3500 cycles

    Carbon Fiber Heat-Resistant Casing, Horizontal and Vertical Mounting
    BCI Group: Usable for all Group Sizes
    Length: 6.6"
    Width: 5.2"
    Height: 6.8"
    Minimum Weight (lbs): 21 lbs
    Post Type: SAE Automotive Posts included & 6 x 1.0mm racing bolts included.
    Stainless Stud: Both Automotive SAE Posts and Race Style Bolts are Stainless with a 6 x 1.0mm bolt pitch

    Recommended Uses:
    Premium Luxury Vehicles
    Extreme Engine Builds - High Compression, Supercharger Systems, Large Cams, Underdrive Pulleys & No Alternators
    Extreme Audio Builds - Multiple Amps, Subs
    Extreme Cold Climates - Daily Driven or Stored Vehicles
    Custom Cars and Vintage Vehicles - No Acid to Spill protect and enhance your vehicle!

    Customers looking to save the most weight on a small displacement purpose built machine - check out the 147-B106C or 147-B14115C Carbon Batteries.


    Overall Length (in.)
    Height (in.)
    12 volts
    Reserve Capacity
    Width (in.)
    Battery Terminals
    Top and side
    Battery Type
    Battery Usage
    Cranking Amps at 0 Degrees F
    550 amps
    Cranking Amps at 32 Degrees F
    742 amps
    Sold individually
    Weight (lbs.)
    Manufacturer's Part Number:

    It's no secret that the lightest car retains the advantage in virtually any motorsports competition because it accelerates quicker, apexes faster, and stops shorter. That's why automotive enthusiasts continue to run Braille Auto Carbon Fiber Batteries. They enhance both the performance and appearance of a vehicle. By using better quality materials in these dry cell/Absorbed Glass Mat batteries, electrical operation increases, and genuine carbon fiber casings show you won't settle for less than the best!

    Note: AGM (Absorbed Glass Mat) batteries are fully charged, ready to install, and compatible with a vehicle's charging system. If additional charging is ever needed, an AGM-compatible charger will be required.

    B3121C - Braille Carbon Fiber Batteries is rated 5.0 out of 5 by 1.
    Date published: 2014-11-01
    • y_2018, m_8, d_20, h_2
    • bvseo_bulk, prod_bvrr, vn_bulk_2.0.8
    • cp_1, bvpage1
    • co_hasreviews, tv_0, tr_1
    • loc_en_US, sid_10001_10001_842113, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs
    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations