Rated 4.80 out of 5 based on 5 customer ratings
(5 customer reviews)

$39.99

ML18-12 – 12V 18AH UPS Replacement Battery compatible with Sigmas SP12-18HR, SP 12-18HR

SKU: ML18-1221112 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

5 reviews for ML18-12 – 12V 18AH UPS Replacement Battery compatible with Sigmas SP12-18HR, SP 12-18HR

  1. Rated 5 out of 5

    Nuker27

    Worked great to replace the batteries in my APC SmartUPS 2200.

  2. Rated 5 out of 5

    Joe D

    I used this for my kids power wheels. It last a long time in comparison to the battery it came with stock. Kids can now ride it for many hours. Just had to cut off the factory plug on the car so it can be connected to this battery.

  3. Rated 5 out of 5

    Dayna Bertaut

    can last the whole day

  4. Rated 4 out of 5

    Christopher D’Amico

    Fully charged when received. Measurements are accurate for overall size and for terminals. Have not installed (seasonal outdoor equipment – chipper shredder vac electric start) so cannot comment on holding charge and recharging and starting capabilities, but do not expect any problem with sealed lead acid battery. Hope to have 7 years of good use out of it. I do store it indoors between seasons.

  5. Rated 5 out of 5

    Darwin Maring

    You will get a charge out of this

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