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

Volts

12V

Amp Hour

18Ah

Chemistry

SLA / AGM

Length

7.12

Width

3.00

Height

6.50

Weight

11.90 Lbs

Warranty

1 Year

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 5245 reviews
Bought this to replace an old internal jnc105 battery on a JNC 770B jump pack. Lots of other people said it worked fine in a JNC660 so figured it would be fine here too. I don't know if there are battery terminal spacing standards but this was NOT a direct fit. Had to space up the positive bar and bend it a little more to reach the switch. Hoping I still make enough contact to do what is needed. Other than that the form factor was right on and it booted up with 12.8V out of the box. Worked for a small jump, time will tell on an upcoming cold winter day I suppose.
Great battery!
New battery install in the restored 1980 KZ750. Perfect fit and turned over the motor for the first fire up in 30 years! My 5th battery for my collection of bikes and happy with the value and reliability of the product.
Worked as advertised
Delivered on time
I received it very quickly - it arrived within one day of ordering it. The last one like this lasted One year and 10 months.
Batteries came in as expected from Amazon and in great shape. Needed for my Daughter Razor E100 electric scooter as replacement.
I am a longtime purchaser of Might Max batteries for my alarm system, garage door openers, and UPS battery back-ups. 100% satisfaction over the years with the longevity of the batteries, cost and rapid delivery. Highly recommend!
Battery arrived fully charged / thought my charger was bad cause lt on barely 5 minutes ,unplugged tried again red lt on , walked away came back off - had scooter 20 ish years and this is 3rd battery- upgraded to the 22 ah from 18- happy with so far - doesn’t get used for prolong periods when used .
Battery is second one I have purchased in 18 years for this polaris....they work well and last long time