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

$39.99

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:
7.12 in x 3.00 in x 6.50 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

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Excellent
Mighty Max Battery
Based on 5353 reviews
Zoro, a subsidiary of Grainger Inc, did a great job getting me the battery for my grandson’s train vehicle in a very short time frame. Much appreciated!
Great product, shipping was as stated 2 days. Appearance and quality seems to be impeccable.
Great battery! The gel design prevents any liquid spills, and it’s maintenance-free. It arrived in excellent condition, well sealed and securely packaged. Very happy with the quality!
Replaced the battery in my mower with this ne and the mower started right up!
Works like a champ.in my Gravery XT.
Arrived fully charged!!!!
Hear it is a great product.
Awesome battery! Super fast shipping and arrived fully charged.
Bought this one for my Can Am Spyder and have the same one in my Can Am Ryker and it's been very reliable for years.
Great purchase, arrived charged and strong