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LFX21L6-BS12 Shorai 12v 21 AH PBEq LiFePO4 Power Sports Battery [- +]

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In order to ship IATA imposed new Shipping Regulations regarding Lithium Batteries. Lithium Batteries being shipped are only charged to 30% of capacity. When you receive this battery it may need to be charged. This is the battery charger we recommend for this battery: Shorai 6v/12v 2 Amp LFX Series Lithium Battery Charger Sho-BMS01

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Product InformationStore Part Number: LFX21L6-BS12


Replaces: HYTX14HL, YTX20HL, HYTX16BHL

The Lithium Iron Phosphate battery is the ultimate in weight versus power technology. This battery weighs in at only 3.03 pounds and offers an incredible 315 C.C.A. This is a drop in replacement for your Lead-acid battery, and will require no change to your stock charging system.

Shorai LFX batteries contain Shorai-proprietary eXtreme-Rate Lithium Iron prismatic cells (chemistry LiFePO4). They contain no poisonous lead, no acid, and do not create gasses during charge, as traditional Lead-Acid batteries do. Compared to lead-acid, Lithium Iron Phosphate batteries are also extremely light, have much lower self-discharge, do not sulfate, and are environmentally friendly.

This is the heavy duty LFX21L6-BS12 battery. It offers an incredible 315 C.C.A., and the Lead-Acid Equivalent of 21 amp hours. It weighs in at only 3.03 pounds and yet still has the power to spin over even the most stubborn engines. Not only does this battery offer incredible advantaged over the lead-acid battery in weight, but also in physical size. This battery will effectively take the place of a YTX20HL in power, but it is not larger than a HYTX14HL battery.

We recommend using this battery in your regular commuters, your frequent play vehicles, and anything that may require that extra punch to start.

*BatteryStuff understands the importance of getting a replacement battery right away and usually ships all batteries the same day as ordered if received before 1:30pm (Pacific), however USPS does not guarantee delivery times with priority mail.


  • No more dead batteries. Holds charge for one year without maintenance
  • Ultra light. One fifth the weight of lead-acid batteries on average
  • Twice to four times the service life of lead-acid batteries
  • Drop-in replacement for your OEM battery
  • Military spec Carbon Fiber Composite Case
  • Faster cranking for better starts
  • Super-fast recharge rate
  • No explosive gasses during charge, no lead, no acid
  • Environmentally friendly
  • Japanese engineering and components


We recommend using these batteries in temperatures above 0 degrees Celsius. This battery may require spacers to make it work in your application. Included with this battery are foam spacers that will aid in fitting this battery. ** PbEq equals Lead-Acid Equivalent. This means that a 21 AH PbEq Lithium Iron Phosphate battery will perform the same as a 21 amp hour Lead-acid battery.

Recommended Charger

Shorai Charger Sho-BMS01
The Sho-BMS01 is a Charge/Store dedicated battery managment system that is designed specifically for Shorai batteries.

Works In

Vehicles that LFX21L6-BS12 works in

BMW 1000cc K100 RS, RT, LT, FL, SRT, ABS (All K100 Models)1993
BMW 1000cc R100RT1987
BMW 1100cc K1100LT/RS(1990-1995)
BMW 1100cc R1100GS(1994-2002)
BMW 1100cc R1100R(1994-2001)
BMW 1100cc R1100RS, RT(1993-2000)
BMW 1100cc R1100S, ABS(1998-2005)
BMW 1150cc R1150GS, R2000
BMW 1150cc R1150GS, R, RS, RT(2001-2006)
BMW 1200cc K1200LT, GT, RT(1999-2003)
BMW 1200cc K1200LT, GT, RT, S(2004-2009)
BMW 1200cc K1200RS(1997-2005)
BMW 1200cc R1200C(1998-2005)
BMW 1200cc R1200CL, CLC(2002-2004)
BMW 1200cc R1200RT(2005-2013)
BMW 1300cc K1300GT(2009-2011)
BMW 1600cc K1600GT, GTL(2011-2019)
BMW 500cc R50/5(1970-1973)
BMW 600cc R60/5(1969-1973)
BMW 650cc R65LS(1978-1984)
BMW 750cc K75C(1985-1995)
BMW 750cc R75/5(1969-1973)
BMW 800cc R80GS, R80ST(1980-1996)
BMW 850cc R850R(1995-1997)
Bombardier Sea-Doo 1500cc GTI(1994-2006)
Bombardier Sea-Doo 1500cc All Models (excluding 4 stroke)(1994-2007)
Bombardier Sea-Doo 780cc 3D, XP(1996-2007)
Harley Davidson 1200cc XL, XLH (Sportster)2012
Harley Davidson 1200cc XL, XLH (Sportster)(2004-2021)
Harley Davidson 1200cc XR1200X(2009-2012)
Harley Davidson 500cc Street(2014-2021)
Harley Davidson 750cc Street(2014-2021)
Harley Davidson 883cc XL, XLH (Sportster)(2004-2021)
Kawasaki 1100cc ZX1100-A GPz(1983-1984)
Moto Guzzi 500cc Falcone UTNot Listed
Yamaha 1049cc EX(2017-2019)
Yamaha 1100cc VX(2009-2013)
Yamaha 1100cc VX, V1(2014-2019)

Tech Specs

  • Dimensions (LxWxH): 5.83 x 3.23 x 5.51 in
  • Part Number: LFX21L6-BS12
  • Weight: 3.03 lb
  • Shipping Weight: 3.5 lb
  • DC Output Voltage: 12V
  • Model: LFX21L6-BS12
  • Manufacturer: Shorai
  • Battery Polarity: -+
  • Warranty: 3 Year Manufacturer
  • Recommended Use: Heavy Duty Powersports
  • Amp/Hr: 21 PbEq
  • C.C.A.: 315
  • Manufacturer Part #: LFX21L6-BS12
  • UPC: 4897034420708
  • Made In: China

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Reviews and Ratings

3.67 Average
5 Stars 2
4 Stars 0
3 Stars 0
2 Stars 0
1 Stars 1
Rated 3.67/5 Stars from 3 customer reviews.

Do you own the LFX21L6-BS12? Please, tell us what you think about it. It helps us provide you with better products. Please note that it may take up to 72 hours for your review to appear.

Lithium 21 AH PBEq
Pros: Just purchased the battery and it is great so far. This is a Lithium that is much smaller than the standard batteries. It was much easier to install with all the "filling material" than I had expected. Enough different size and thickness material comes with the battery that you only need to select the correct material and cut to fit. The whole process took less than 15 minutes to have the battery and filling material properly sized. Battery is too new to say how well it holds up. Since it's about twice the price of a standard battery, I hope to get at least five years before replacing.
Cons: None so far.
Is this review helpful?
Written by on Mar 09, 2012. Ownership: Just Bought. Knowledge Level: AC/DC is more than a band — (89 of 172 customers found this review helpful
Something REALLY New and Improved
Pros: This battery is a dream. I can't believe the low weight. Not only is the weight of the bike reduced, but installation in the tight spot on my bike was easier because the battery is so much easier to handle. The instruction sheet was complete and simple. The future is NOW!
Cons: None!
The only thing I had to give extra effort to was that the battery box needed shims as the new unit is slightly shorter than the original unit. The shims provided are easy to cut to fit where necessary, and took just a few minutes to install once I measured the old and new.
I am very glad that I spent a few extra $ to move into the 21st century.
Is this review helpful?
Written by on Aug 21, 2015. Ownership: Just Bought. Knowledge Level: AC/DC is more than a band — (6 of 9 customers found this review helpful
bad company
These people will not stand behind their product. I have filled out the form they requested and called them several times. They will not answer the calls they just have you leave a voice message and say they will get back to you but they never call you back
***Note From ***
Customer emailed initially about his concern and was advised the battery he purchased back in 2018 was under warranty through the manufacturer. Shorai chooses to handles all warranty request for their batteries directly, so the customer was given Shorai's contact information and advised to contact Shorai directly. Unfortunately, due to Covid-19 most manufacturers including Shorai are down to minimal staffing, which is increasing the time it takes to reply to customer claims. Given the customers recent review did contact Shorai to help expedite the customer warranty request. We were advised by Shorai that the customer was emailed a few days after their initial request for warranty. Per Shorai's warranty: Warranty replacements after the first year from the original date of purchase are prorated 50% from retail, so the customer was emailed the a 50% off coupon to purchase a new battery off Shorai's website.
Is this review helpful?
Written by on Jul 02, 2020. Verified Purchase — (2 of 3 customers found this review helpful

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Manuals & Tutorials

Installation Guide

User Manual

Lithium Battery Overview

Shorai Abuse Test

Lithium Iron FAQ

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