Rated 4.76 out of 5 based on 34 customer ratings
(34 customer reviews)

$39.99$159.99

ML18-12 – 12V 18AH Replacement Battery compatible with 51913 BMW R1100RS, R1100RT

SKU: ML18-1221127 Category:
Thumbnail Short Description Price Add to Cart Button
$ 39.99
$ 79.99
$ 159.99
Delivering power when you need it, the Mighty Max ML18-12 12 Volt 18 AH uses a state of the art, heavy-duty, calcium-alloy grid that provides exceptional performance and service life in both float and cyclic applications.
The ML18-12 is an Absorbent Glass Mat (AGM) technology with a valve regulated design, that can be used in enclosed and indoor environments without leaking or maintenance, providing a superior performance for thousands of models.
Mighty Max SLA batteries are utilized in a wide variety of applications including; Consumer Electronics, Electric Vehicles, Engine Starters, Golf Carts, Hunting, Lawn and Garden Tools, Medical Mobility, Motorcycles, Power sports, Portable Tools, Solar, Toys and Hobby, Access Control Devices, Emergency Lighting, Security and  more.  
Specifications: 
Voltage: 12 Volt
Amperage: 18 AH
Chemistry: SLA, AGM
Terminal: Nut and Bolt (NB)
Battery Dimensions:
7.17 in x 3.03 in x 6.57 in
Weight: 11.90 Lbs
Warranty
1 Year
Multi Packs Bundled Savings

1 Pack, 2 Pack, 4 Pack

34 reviews for ML18-12 – 12V 18AH Replacement Battery compatible with 51913 BMW R1100RS, R1100RT

  1. Rated 4 out of 5

    Gman

    Fit great and started right up like the fit. We see how long this batter will last.

  2. Rated 4 out of 5

    judith nicholson

    For one fourth the price I paid for a battery that only lasted 2 years I was happy. Only time will tell but if it lasts at least one year, I’m way ahead.

  3. Rated 5 out of 5

    Web Customer

    Fits perfectly with lots of power.

  4. Rated 5 out of 5

    Customer

    Fits perfectly with lots of power.

  5. Rated 5 out of 5

    jerry f weber

    Fit s the m/c went on a BMW R1100 S

  6. Rated 5 out of 5

    jerry f weber

    Fit s the m/c went on a BMW R1100 S

  7. Rated 5 out of 5

    Gonzo

    Best price I could find! Fit in my 2000 r1100rt with minor modification. So far so good!

  8. Rated 5 out of 5

    Matt

    Bought for my BMW R1150R. Needed a little tweak to the + side post but YMMV. The battery is brand new so it’s hard to say a lot about the quality, but it did start the bike right up after quite a while in storage, so no complaints. I did have a question/concern about charging with a Battery Tender, and MM went above and beyond to get it all sorted out. Truly outstanding customer service. Thank you MM! A+++++

  9. Rated 5 out of 5

    Matt

    Bought for my BMW R1150R. Needed a little tweak to the + side post but YMMV. The battery is brand new so it?s hard to say a lot about the quality, but it did start the bike right up after quite a while in storage, so no complaints. I did have a question/concern about charging with a Battery Tender, and MM went above and beyond to get it all sorted out. Truly outstanding customer service. Thank you MM! A+++++

  10. Rated 5 out of 5

    Professor8

    Great battery fair price and easy installation.

  11. Rated 5 out of 5

    Professor8

    Great battery fair price and easy installation.

  12. Rated 4 out of 5

    WTI

    Battery works. No long-term test yet. Excellent price/value, of course. But not an exact replacement; the form-factor was fine (for BMW RT1100), but the terminals were smaller, so I had to ream them out. To be precise, the terminals are 2mm thick with a 5.5 mm hole offset from edges by 3.3mm (bottom), 2.2mm (top) and 3.5mm (sides). The supplied screws are chromed (nice) but small, so you might want your own.

  13. Rated 5 out of 5

    Philip K. Ireland

    Ordered one for my motorcycle. Works great so far at 3 months. Ordered another for my riding mower. All good so far. I have them both on trickle chargers. We’ll see what they do in 12 months.

  14. Rated 5 out of 5

    Jeannec

    Came fully charged – holds a charge – Good fit for my BMW R1100RT (2000). The battery fit in it’s compartment without need for any modification. I would recommend this battery to anyone needing a battery for a BMW bike.

  15. Rated 5 out of 5

    Duckman

    worked great

  16. Rated 5 out of 5

    Duckman

    worked great

  17. Rated 4 out of 5

    Andrew Leighton

    Works at least as well as the OEM battery.

  18. Rated 5 out of 5

    DBD

    Battery fit my 1999 BMW R1100RT perfectly. Came with new wire attachment screws for the slightly smaller holes on the posts.

  19. Rated 4 out of 5

    DafaltUsr

    Second battery from these guys. The battery fired the bike right up. Arizona is tough on vehicle batteries. The last battery held up fairly well.

  20. Rated 4 out of 5

    DafaltUsr

    Second battery from these guys. The battery fired the bike right up. Arizona is tough on vehicle batteries. The last battery held up fairly well.

  21. Rated 5 out of 5

    Terry Barber

    Works great!

  22. Rated 5 out of 5

    Terry Barber

    Works great!

  23. Rated 5 out of 5

    kurt baker

    A gift for father in-law he loves it ,says he might order another next year for his Kawasaki mule.

  24. Rated 5 out of 5

    robie

    fast and ready to go

  25. Rated 5 out of 5

    robie

    fast and ready to go

  26. Rated 5 out of 5

    Arie

    This was the least expensive of my options and I decided to give it a try because the last battery was the most expensive and didn’t last long. The battery works great so far and seems very well made. I definitely recommend saving some money by buying this battery.

  27. Rated 5 out of 5

    Customer

    It’s a great battery at a great price!

  28. Rated 4 out of 5

    Customer

    the holes in the terminals had to be drilled out but other than that the battery exceded my expectations

  29. Rated 4 out of 5

    Kay

    Function seems fine. Connectors are undersize requiring rework or smaller bolts plus rework of cable ends.

  30. Rated 5 out of 5

    John D. Dugan

    Great Deal

  31. Rated 5 out of 5

    James Bentley

    Battery has has demonstrated above and beyond my expectations Thank you

  32. Rated 5 out of 5

    stealthdad

    works great, plenty of power to start 1100 cc high compression motor every time,great value

  33. Rated 5 out of 5

    Alex Steinhauser

    Fast Shipping. Item as described. Very Happy.

  34. Rated 5 out of 5

    Elmo Warren Hardt

    great deal

Only logged in customers who have purchased this product may leave a review.