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The MotoBatt MB51814 QuadFlex AGM Battery Replaces These 2 OEM Batteries
MotoBatt SKU Ah CCA L x W x H (inches) L x W x H (mm) Total Terminals
MB51814 22 220 7.20 3.15 6.69 183 80 170 4 QuadFlex
Replaces These OEM BMW & Yuasa Part Numbers
OEM Model Ah CCA L x W x H (inches) L x W x H (mm)  
51814 18 175 7.32 3.23 6.73 186 82 171
51913 18 170 7.32 3.07 6.73 186 78 171


  • BMW R50/5 (70-73) - 500CC
  • BMW R60/5 (70-73) - 600CC
  • BMW R65LS (78-84) - 650CC
  • BMW R75/5 (70-73) - 750CC
  • BMW K75CS (85-95) - 750CC
  • BMW R80GS R80ST (80-96) - 800CC
  • BMW R850R (95-97) - 850CC
  • BMW K1100LT/RS (90-95) - 1100CC
  • BMW R1100R (94-00) - 1100CC
  • BMW R1100S (99-00) - 1100CC
  • BMW R1100GS (94-00) - 1100CC
  • BMW R1100RS RT (93-00) - 1100CC
  • BMW R1150GSR (00-05) - 1150CC
  • BMW K1200LTGTRSS (99-05) - 1200CC
  • BMW R1200C (98-05) - 1200CC
  • BMW K1200LTGT (05-09) - 1200CC
  • BMW R1200RT (05-12) - 1200CC
  • BMW K1200RS (97-05) - 1200CC
  • BMW K1300GT (09-11) - 1300CC
  • BMW K1600GTGTL (11-12) - 1600CC

and others!

MotoBatt being a premium Absorbed Glass Mat battery is superior by design. AGM batteries have been used in demanding military and off -road applications for many years. The sealed, glass mat design has many longevity and reliability based benefits.

Each plate in the battery is wrapped in a fibrous glass matting which not only absorbs all liquid electrolyte but keeps the plates separated in a cushioned environment. This stops the plates from vibrating which can breakdown the plate and cause short circuits between the plates or break plate welds which result in battery failure. The thick, heavy plates used in MotoBatt designs really make the difference here.

AGM batteries also have a much lower inherent self-discharge rate than wet flooded types. And, as a higher amp hour AGM battery, the MotoBatt battery can also discharge more deeply and recover repeatedly under vehicle alternator charge or through maintenance charging. A standard flooded cell battery is not capable of withstanding this type of cycling, without pre-mature failure.

Your Motobatt is a Factory Activated battery. It comes to you pre-conditioned and fully charged for optimum performance and ready to install out of the box. 80% of early PowerSports battery failure is caused by faulty activation of the dry battery plates. Additionally, you never have to mess with acid or top up fluid levels or remove corrosion from the terminals caused by gassing; common with standard flooded battery types.



If you are not sure which Motobatt there is a selector at www.motobatt.com or check what battery your machine has now and enter it into our search field.