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

(34 customer reviews)

From: $39.99

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

SKU: ML18-1221127 Category:
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$ 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

Volts

12V

Amp Hour

18Ah

Chemistry

SLA / AGM

Length

7.17

Width

3.03

Height

6.57

Weight

11.90 Lbs

Warranty

1 Year

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

  1. Gman

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

  2. 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. Web Customer

    Fits perfectly with lots of power.

  4. Customer

    Fits perfectly with lots of power.

  5. jerry f weber

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

  6. jerry f weber

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

  7. Gonzo

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

  8. 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. 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. Professor8

    Great battery fair price and easy installation.

  11. Professor8

    Great battery fair price and easy installation.

  12. 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. 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. 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. Duckman

    worked great

  16. Duckman

    worked great

  17. Andrew Leighton

    Works at least as well as the OEM battery.

  18. DBD

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

  19. 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. 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. Terry Barber

    Works great!

  22. Terry Barber

    Works great!

  23. kurt baker

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

  24. robie

    fast and ready to go

  25. robie

    fast and ready to go

  26. 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. Customer

    It’s a great battery at a great price!

  28. Customer

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

  29. Kay

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

  30. John D. Dugan

    Great Deal

  31. James Bentley

    Battery has has demonstrated above and beyond my expectations Thank you

  32. stealthdad

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

  33. Alex Steinhauser

    Fast Shipping. Item as described. Very Happy.

  34. Elmo Warren Hardt

    great deal

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Mighty Max Battery
Excellent
4.8
Based on 452 reviews
Mighty max brings the battery backup back.
Arrived well packed in unopened sturdy box. Was replacement for identical Mighty Max battery I ordered 2 years ago. Taking 1 star off because didn’t include the needed terminal clips - was able to use the old battery’s clips
Same model fits in each of our four wheelers great product
Replacement for my Murray MT100 riding lawnmower. Murray does not make replacement batteries and you are on your own if the battery goes bad. Bought Murray MT100 in 2023, battery went bad in 1 year and all other Murray replacement batteries are LARGER so it won't fit.This Mighty Max Battery fit the MT100 fine and it starts it perfectly too.
Direct replacement for generac portable electric start generator. Works great.
Received really quick. Boxed well and fit great. Worked like a charm! I would definitely recommend this battery.
As an athletic trainer I rely on our water units every day to provide the water to our athletes. We have over 900 student athletes enrolled, and these units get used daily, so it is imperative these batteries are reliable. On a side note, I also use these batteries on my fishing kayak to power my fish finder. I can use my fish finder for about 20 hours before it turns off. These batteries are great! Highly recommend. I have not had any issues so I haven't spoken to customer service yet, but if they are as good as these batteries have been, I think I am in good hands.
Needed a replacement battery and the manufacturer wanted $50 whereas you only required $20. Made it worth it!
satisfy with price and easy installation.
Arrived in great condition comes with the bolts to attach the wire over all very satisfied
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