Rated 4.84 out of 5 based on 50 customer ratings
(50 customer reviews)

$39.99

12V 18AH SLA Internal Thread Replacement Battery for ES1230

Availability: In stock

SKU: ML18-12INT577 Category:
Delivering power when you need it, the Mighty Max ML18-12 Internal Thread 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 Internal Thread 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: Internal Thread
Battery Dimensions:
7.13 in x 3.01 in x 6.57 in
Weight: 11.90 Lbs
Warranty
1 Year
Volts

12V

Amp Hour

18Ah

Chemistry

SLA / AGM

Terminal

Internal Thread

Quantity

1

Length

7.13

Width

3.01

Height

6.57

Weight

11.90 Lbs

Warranty

1 Year

50 reviews for 12V 18AH SLA Internal Thread Replacement Battery for ES1230

  1. Rated 5 out of 5

    Betty Hillard

    First battery was bad they replaced no problem right a way good company.

  2. Rated 5 out of 5

    brian Ohlis

    I bought is battery and USPS said they delivered it…never received it and filed a claim with USPS. After two weeks of horrible customer service with USPS they wouldn’t do anything about it. Mighty Max Battery had my back the entire time with amazing follow Up. After all of this USPS would not do anything and Mighty Max Battery is sending me another replacement at no cost even though it was not their fault. Amazing company!!!!! I would recommend them for anything they sell. Thank you Might Mad Battery.

  3. Rated 1 out of 5

    KOEHLER

    Every time I try 2 USE it THE BATTERY DIDN’T have a Neff charge 2 start my jeep

  4. Rated 5 out of 5

    Kenzie batt

    The shop I work at was throwing a jump starter away, took it apart and check out the battery, for same battery it’d be $199. This battery works for the JNC66D which is a autozone or advanced brand they sell and it fits almost perfect, just a bit more snug but all in all exactly the same for a fraction on the price. Very happy

  5. Rated 5 out of 5

    Kenzie battKOEHLERWeb CustomerBrewRiyadh A.

    Arrived on time, easy to install, I did the swap myself. It is exact replacement for ES5000 battery.

  6. Rated 5 out of 5

    Hussle Man

    This battery saved me from buying a new jumper.

  7. Rated 5 out of 5

    SAM

    My husband converted a electric generator to gas and needed a new battery. This fit the bill and it works great. We would purchase this again.

  8. Rated 4 out of 5

    80s dude

    Easy installation but you will need to bend the leads to match the terminal locations on this battery. Can be done with no risk of shorting anything in the booster. So far held charge for 2 months. I usually charge after each use or every month. Hope it lasts as long as the original battery which costs as much as a new booster pack!

  9. Rated 5 out of 5

    oscar arriaza

    I did the swap myself , easy to medium difficulty its working good for me.

  10. Rated 5 out of 5

    Dan HVAC guy

    The battery was an exact replacement, fit perfectly and works well

  11. Rated 5 out of 5

    gold’s member

    Good value

  12. Rated 5 out of 5

    BarryP

    It was an exact fit and my unit is like new. I haven’t had it long enough to rate the Longevity and Battery Life but so far so good.

  13. Rated 5 out of 5

    travis mueller

    Great replacement.

  14. Rated 5 out of 5

    Nuv

    No complaints so far. Packaged nicely correct size and full bars. Definitely beats buying one from a local battery store for 70-120 bucks. This was installed in a ES5000. Hardware provided for terminals.

  15. Rated 5 out of 5

    n00b

    No complaints so far. Packaged nicely correct size and full bars. Definitely beats buying one from a local battery store for 70-120 bucks. This was installed in a ES5000. Hardware provided for terminals.

  16. Rated 5 out of 5

    Ray H.

    good value

  17. Rated 5 out of 5

    Grant

    Replacement battery for Jump and start. Thank you. Grant.

  18. Rated 5 out of 5

    Grant

    Replacement battery for Jump and start.Thank you.Grant.

  19. Rated 5 out of 5

    Deborah R.

    This item was an exact fit and worked perfectly.

  20. Rated 5 out of 5

    Deborah R.

    This item was an exact fit and worked perfectly.

  21. Rated 5 out of 5

    Keith fisher

    Excellent product all matched up with my install. Had no problems at all except talking my boss into buying 15 more for the rest of the trucks.

  22. Rated 5 out of 5

    Keith fisher

    Excellent product all matched up with my install. Had no problems at all except talking my boss into buying 15 more for the rest of the trucks.

  23. Rated 5 out of 5

    John B Richards

    Sure saves from having to buy a whole new jump box.

  24. Rated 5 out of 5

    B & B

    I liked the service

  25. Rated 5 out of 5

    michael w jordan

    Does what it should

  26. Rated 5 out of 5

    eugene fair

    Easy to install have three jump boxes installed three battery works great

  27. Rated 5 out of 5

    eugene fair

    Easy to install have three jump boxes installed three battery works great

  28. Rated 5 out of 5

    Tim Nummerdor

    Okay

  29. Rated 5 out of 5

    Charles B.

    The battery, other than the original, is an exact replacement for what I needed.

  30. Rated 5 out of 5

    Alaskan buyer

    Just installed in my booster pac brand ES5000. Fit just as factory battery. The positive and negative posts were closer to the outer edges compared to the original battery which were about 3/4 closer to the center but cables still reached and everything tucked back into place without restricting reassembling of back cover. I Saved the original threaded studs, washers, lock nut and nuts to reused. Great way to reduce waste and save money at the same time.

  31. Rated 5 out of 5

    Alaskan buyer

    Just installed in my booster pac brand ES5000. Fit just as factory battery. The positive and negative posts were closer to the outer edges compared to the original battery which were about 3/4 closer to the center but cables still reached and everything tucked back into place without restricting reassembling of back cover. I Saved the original threaded studs, washers, lock nut and nuts to reused. Great way to reduce waste and save money at the same time.

  32. Rated 5 out of 5

    jason

    Works great

  33. Rated 5 out of 5

    Jade Dela Cruz

    Shipping was fast and I was able to change the battery on my power pack. Defiantly recommend this, instead of buying a new power pack.

  34. Rated 5 out of 5

    Jade Dela Cruz

    Shipping was fast and I was able to change the battery on my power pack. Defiantly recommend this, instead of buying a new power pack.

  35. Rated 5 out of 5

    Joseph K.

    You need to make a slight modification to mount it to the original jumper case

  36. Rated 5 out of 5

    Joseph K.

    You need to make a slight modification to mount it to the original jumper case

  37. Rated 5 out of 5

    Bernie Massin

    Came with a good charge and I put a load tester on them and they held over 12 volts.

  38. Rated 5 out of 5

    John P

    Replaced the battery in in my ES5000 Booster Pac. Brought it back to full capacity and was an easy swap out with the original battery

  39. Rated 5 out of 5

    stanley

    Good price. Battery arrived showing 13 volts.

  40. Rated 4 out of 5

    G

    Fast delivery and price thank you

  41. Rated 5 out of 5

    Max Snare

    Perfect for my application

  42. Rated 5 out of 5

    ZrUs

    Good battery. A lot cheaper than the other ones and works good.

  43. Rated 5 out of 5

    don hutto

    Works great

  44. Rated 4 out of 5

    Peter

    Installed with a few gentle nudges. All needed hardware fit. Still holding charge after 3 months. Too soon to tell if it’ll work as the original – haven’t found a dead auto to try it out… Either way, will comment again.

  45. Rated 4 out of 5

    Peter

    Installed with a few gentle nudges. All needed hardware fit. Still holding charge after 3 months. Too soon to tell if it’ll work as the original – haven’t found a dead auto to try it out… Either way, will comment again.

  46. Rated 5 out of 5

    Web Customer

    Awesome part at an awesome price!

  47. Rated 5 out of 5

    Customer

    Awesome part at an awesome price!

  48. Rated 5 out of 5

    Web Customer

    Quality item just as described.

  49. Rated 5 out of 5

    Customer

    Quality item just as described.

  50. Rated 5 out of 5

    Brew

    This battery is excellent and works great. When I received the battery earlier than expected, it was fully charged and ready to go.

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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