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Intensity Lithium-ION Braille Battery i35X - 11.4lbs - (NO LONGER AVAILABLE)

Replace your stock, heavy battery with a direct replacement, lightweight performance Lithium battery that weighs in at only 11.4lbs!
Upgrade for a standard Group 35 size battery.
Mfg Part #
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Note:This product is no longer available.

Product Details

Upgrade for a standard Group 35 size battery.

Whether you are looking to replace your battery to reduce weight for track purposes or just want to upgrade to a lithium battery for it's long life and exceptional reliability, Braille Battery has you cover with their Intensity line of Lithium-ION batteries. Designed to the same stock specifications in terms of size, for easy installation and proper fitment, these batteries are significantly light that stock batteries by a ridiculous amount! The i34 battery weighs in at only 11.41lbs! This is a ~40 pound reduction in weight, while still producing a whopping 1438 Pulse Cranking Amps (PCA) and offering a 26 Lithium Amp Hour/Lead-Acid Equivalent capacity. This makes the i35X another leader in the battery industry for performance to weight ratio by a significant margin!

Some may ask, "Why should I upgrade to a Lithium battery?"

Braille Lithium delivers a higher, cleaner voltage which improves the performance of every electrical component and has shown to provide:

  • Quicker starting (a full volt higher than lead and less voltage drop during cranking)
  • Improved engine management & data logging performance (more stable voltage)
  • Less horsepower draw from the alternator due to efficient charging (5 times faster than lead),
  • Lasts 3-5 times longer (especially under the harshest environments),
  • Much more reliable (less than 1% failure rate)
  • Significant weight savings. (up to 1/4 the weight)
  • Don’t self-discharge, so if the battery is disconnected (no draw or via power disconnect switch), they can sit for over a year and still have over 13 volts to start the vehicle.

To get all these benefits in one simple step makes it a very cost effective upgrade!!

Physical Specifications:

  • BCI Group:  35
  • Weight:  11.54lbs / 5.17kg
  • Length:  9.45" / 240mm
  • Width:  6.8" / 173mm
  • Height:  8.54" / 214mm
  • Polarity:  Right Side Positive

Performance Specifications:

  • Voltage:  12
  • Full Charge Voltage:  13.8
  • Pulse Cranking Amps (PCA):  1438
  • Amp Hour (AH):  25
  • Lithium Amp Hour/Lead-Acid Equivalent (LAH/PbEq):  75
  • Life Cycle @ 10% DOD:  5000

** PbEq equals Lead-Acid Equivalent also known as LAH Lithium-Amp-Hours. This means that a 72 LAH PbEq (24AH) Lithium Iron Phosphate battery could perform the same near as a 72 AH Lead-acid battery under a high rate discharge in comparison.

When installing a lithium battery in a MINI that requires the battery to be coded in, Braille recommends setting the battery code to the lowest/smallest AGM battery setting possible.

Before purchasing a battery, please double check the size of your stock battery and the battery compartment. Many MINI's can use both a Group 34 or Group 35 size, but some vehicles are limited to Group 35 only due to constraints in the battery's total length.

This part does not have vehicle applications yet. For fitment verification, contact our sales team via 1.800.924.5172, Live Chat , or

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Manufacturer names and/or part numbers are used only for identification purposes.

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