Rated 4.88 out of 5 based on 41 customer ratings
(41 customer reviews)

$39.99

ML18-12 – 12V 18AH Battery Replaces NP18-12 51814 6FM17 6-DZM-20 6-FM-18

SKU: ML18-1221184 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

Terminal

Nut and Bolt

Quantity

1

Length

7.12

Width

3.00

Height

6.50

Weight

11.90 Lbs

Warranty

1 Year

41 reviews for ML18-12 – 12V 18AH Battery Replaces NP18-12 51814 6FM17 6-DZM-20 6-FM-18

  1. Rated 5 out of 5

    Web Customer

    THE BATTERIES WERE FOR MY WIFES CART

  2. Rated 5 out of 5

    Tom

    Fits like a glove

  3. Rated 5 out of 5

    cap440

    Fit perfect

  4. Rated 5 out of 5

    Biar B. Wayor

    Once you pick it up, you can’t put it down, and it’s heavy.

  5. Rated 5 out of 5

    Jesus Pelaez

    the correct size

  6. Rated 5 out of 5

    Katedfrock

    Works perfect to replace the battery that died in my car charger, air compressor unit

  7. Rated 5 out of 5

    Joseph M. Young

    Great match works great

  8. Rated 5 out of 5

    barrie

    Fair price and I didn’t have to leave my house.

  9. Rated 5 out of 5

    Paul

    The description is the same as the business! It is well mounted on a portable power supply

  10. Rated 5 out of 5

    Irene Clow

    I replaced the battery in my portable compressor, jump start power supply and saved $80 or more over buying a new one.

  11. Rated 5 out of 5

    Web Customer

    it’s a great product!

  12. Rated 5 out of 5

    Customer

    it’s a great product!

  13. Rated 5 out of 5

    Reader

    Replacement for generator battery. Price was right. Difficult to rate longevity right after receiving the product.

  14. Rated 5 out of 5

    Reader

    Replacement for generator battery. Price was right. Difficult to rate longevity right after receiving the product.

  15. Rated 5 out of 5

    Svetoslav A.

    Used for jumper pack

  16. Rated 5 out of 5

    Svetoslav A.

    Used for jumper pack

  17. Rated 5 out of 5

    Dan Burgess

    Fixed my battery jump starter

  18. Rated 5 out of 5

    Dan Burgess

    Fixed my battery jump starter

  19. Rated 5 out of 5

    Anonymous

    I bought this to replace the battery in a 5 in 1 charger. So far it has worked great and saved me the 159 to buy a new one.

  20. Rated 5 out of 5

    Thomas m

    Good price and I could find one in my city checked all the businesses that sell battiers and not one had this battery.

  21. Rated 5 out of 5

    RICHARD P.

    FIT RIGHT IN THE JUMP STARTER. HAD QUICK DELIVERY

  22. Rated 5 out of 5

    RICHARD P.

    FIT RIGHT IN THE JUMP STARTER. HAD QUICK DELIVERY

  23. Rated 5 out of 5

    Web Customer

    Just required a slight touch up charge and ready to go.

  24. Rated 5 out of 5

    Customer

    Just required a slight touch up charge and ready to go.

  25. Rated 5 out of 5

    Web Customer

    Item was an exact replacement for the previous 6FM17 battery I was using.

  26. Rated 5 out of 5

    Customer

    Item was an exact replacement for the previous 6FM17 battery I was using.

  27. Rated 5 out of 5

    prudis lebron

    Well made, strong batteries!

  28. Rated 5 out of 5

    R. Secrest

    Fit perfectly in charger box and works well.

  29. Rated 5 out of 5

    Cole

    I used this battery to replace my old one inside of a air compressor/jumper box mix. So far works and charges just like the old one. Battery test shows the correct voltage it is supposed to be. Amazing product for nearly half the price of others!

  30. Rated 5 out of 5

    Cole

    I used this battery to replace my old one inside of a air compressor/jumper box mix. So far works and charges just like the old one. Battery test shows the correct voltage it is supposed to be. Amazing product for nearly half the price of others!

  31. Rated 5 out of 5

    Edwin Charles Denham

    Price was good, delivery time expedient, product seems to be oem quality or better.

  32. Rated 5 out of 5

    BOB

    it worked

  33. Rated 4 out of 5

    bill mock

    Fit perfict,

  34. Rated 5 out of 5

    Richard shannon43

    I really believe that this battery works better than the one that came with the battery jump start/compresser. holds a charge longer and doesn’t take as long to re-charge great battery!!!

  35. Rated 4 out of 5

    Alan

    Installed in used Worx mower. The factory replacement battery was pretty pricey, so I replaced the smaller batteries (14ah) with these by disassembling the case that contains the charger, and rewired these to the mower, also using a motorcycle ‘battery tender’ so they can be recharged. Works like the factory intended, but at 25% the cost.

  36. Rated 3 out of 5

    ppk49

    The terminals are 1/2 inch inside the edges so I had to buy 4 nuts (2 each side) to be able to connect the terminal cables of my automobile starter and tire inflator. Be warned! Otherwise theaters has performed flawlessly once installed.

  37. Rated 4 out of 5

    Max T. Nigh

    All as expected in my 7.5KW standbypower system.

  38. Rated 5 out of 5

    Azaleaghost

    Fit generator perfectly!

  39. Rated 5 out of 5

    S. Lynn

    Great. The positive connecting ear is not quit the same location as the original, but it worked.

  40. Rated 5 out of 5

    Felipe Penullar

    Perfect! came on time

  41. Rated 5 out of 5

    Felipe Penullar

    Perfect! came on time

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

Excellent
Mighty Max Battery
Based on 3474 reviews
Arrived quickly. Even got a sticker with it.
Solid looking battery, came well packaged. Have used their battery before for my lawnmower and now looking forward to see how it lasts in my snowmobile.
I can't believe it less than 48hrs since I ordered from Walmart and it's in the machine. What more can I say except great price.
Thanks Larry
Item as described and perfect fit and arrived on time
Battery arrived in a good shape package strait to my door steps
Arrived just in time to power my generator here in the cold Maine winters. Excellent service!
Arrived quickly from WALMART.COM. Perfect size and proper placement in my generator. Installation was easy. Generator fired right up. Battery came fully charged.
New battery. Ready for cold weather!
So far these Might Max batteries are good but it’s only the first day and they were on charge for 12 hrs. I’ll have to come back and do an update at some point in time. Ordered them on Amazon and got them the next day. I was encouraged by Mighty Max to make this google review and post pictures to extend my warranty for 3 months but there is no way to post pictures 🤣🤣🤣 It’s been a few months and I was able to go back and edit, so here is a video I made, the rest of the photos I have deleted. Batteries are still going strong. Update 12-11-2025
They arrived within 2 days of ordering them packaging was really good I haven't put them in my MX350 yet I hit them with my multi meter fresh out of the box and got 12.4v on both batteries so that is good