Rated 4.46 out of 5 based on 37 customer ratings
(37 customer reviews)

$18.99

12V 3AH SLA Battery for Black Decker CST1200 Cordless Trimmer

Availability: In stock

SKU: ML3-12106732 Category:
Delivering power when you need it, the Mighty Max ML3-12 12 Volt 3 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 ML3-12 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: 3 AH
Chemistry: SLA, AGM
Terminal: F1
Battery Dimensions: 
5.28 in x 2.64 in x 2.64 in
Weight: 3.20 Lbs
Warranty
1 Year
Volts

12V

Amp Hour

3Ah

Chemistry

SLA / AGM

Terminal

.187" – F1

Quantity

1

Length

5.28

Width

2.64

Height

2.64

Weight

3.20 Lbs

Warranty

1 Year

37 reviews for 12V 3AH SLA Battery for Black Decker CST1200 Cordless Trimmer

  1. Rated 5 out of 5

    Curt Richrath

    This batterie brought my old but still usable weed-eater back to its old self.

  2. Rated 5 out of 5

    Sanford Remer

    Old battery died quickly, installed this one works fine

  3. Rated 5 out of 5

    BilldonhollStevenvincepMacroManken stricklandRon MacDougall

    Perfect replacement battery. Actually lasts longer on a charge than the orignal ever did.

  4. Rated 5 out of 5

    Ron MacDougall

    Perfect replacement battery. Actually lasts longer on a charge than the orignal ever did.

  5. Rated 5 out of 5

    Phillip B.

    there shipping on time , when the product was shipped and when it would arrive (very good ) I use it in my weed eater a black & decker

  6. Rated 3 out of 5

    john h.

    i had my electric weed eater for 2 years, it stopped being powerful, like it couldnt even cut a blade of grass. after swapping out the battery (you need a long skinny screwdriver FYI) it felt like it was brand new, it was destroying grass and weeds again, but it only had enough charge to do the front or back yard. i just charge it between the two now, it skip one side each mowing.

  7. Rated 5 out of 5

    Biffus

    As best I can remember it works as well as the original battery when it was new

  8. Rated 5 out of 5

    Evan Axenroth

    Easy to install, more powerful and longer lasting than original

  9. Rated 4 out of 5

    patrick wooten

    youtube video ready help to install. Instruction booklet not the greatest.

  10. Rated 4 out of 5

    kerrie griffis

    Perfect fit. Trimmer has plenty of power.

  11. Rated 4 out of 5

    rettox

    Battery came in specified time, and performed as expected.

  12. Rated 5 out of 5

    CRAIG A ROBERTS

    Works as described

  13. Rated 5 out of 5

    xxx

    Great battery so far. If you get this and need to install it but need help, there’s a tube instructional you can find online.

  14. Rated 5 out of 5

    xxx

    Great battery so far. If you get this and need to install it but need help, there’s a tube instructional you can find online.

  15. Rated 3 out of 5

    burt hurst

    ok

  16. Rated 4 out of 5

    Duke A

    Battery arrived when it was scheduled and well packaged. The battery was easy to install. It does not have as long run time in the grass trimmer as the OEM battery.

  17. Rated 4 out of 5

    DonnaDuke

    Battery arrived when it was scheduled and well packaged. The battery was easy to install. It does not have as long run time in the grass trimmer as the OEM battery.

  18. Rated 4 out of 5

    Bill

    This battery was an exact fit for my old Black and Decker CST 1200 string trimmer. The first battery received did not perform as expected.Mighty Max Battery Customer Care sent a follow-up email asking about my satisfaction with their product and service. I explained the issue with the battery and I received a prompt and very courteously reply. A replacement battery was sent free of charge. I have been using that battery for about two months. A full charge does not last quite as long as the original battery but it is sufficient to trim my front drive, sidewalk and side fence. I am pleased with the quality of service provided by the Customer Care personnel and would order from Mighty Max Battery again.

  19. Rated 5 out of 5

    Jean Anderson

    As advertised. Fixed my weedeater

  20. Rated 5 out of 5

    Bread Guy

    works perfectly

  21. Rated 5 out of 5

    Dennis Dworak

    Works fine & fits properly.

  22. Rated 3 out of 5

    donholl

    Installing the battery is reasonably easy (although you’ll need a screwdriver shaft-type T15 wrench: many of the screws are too deep-set for most socket-type ones to access).Unfortunately, the battery isn’t performing much better than the nearly-dead factory one it replaced: I get about 8 minutes of enough RPMs to actually cut through grass and small leafy weeds – not enough to finish even my small back yard (about 18X25 – plus a plant bed).Interestingly, the battery seemed to be nearly, if not fully, charged when installed: I took it out for a good 5-7 minutes of full-speed cutting – without any sign of slow-down – before initially putting it on the charger (if it shouldn’t have been run at all until charged, some instructions to that effect should have been included – there was nothing but the battery and packing materials in the box). It hasn’t performed as well any time since.I suppose it’s possible the issue is with the charger (the lone, always-red yes – it’s hooked up LED indicator on the trimmer isn’t exactly a big help), but I’m not willing to invest another $25 or so on a replacement one hoping that’s true: I’m going back to the lighter weight and consistently high-RPM performance of a corded unit (Li-ion batteries might perform better than SLA, but those trimmers are 3-4X the price of a decent corded one – no thanks).

  23. Rated 5 out of 5

    Goat_Whisperer

    Got this to replace the old battery in my wife’s trimmer. Took about 10 minutes to open up the trimmer and replace the battery. Works great.

  24. Rated 5 out of 5

    Scottish Geeks

    Perfect replacement at a great price. Charged right up and was a direct fit for my trimmer.

  25. Rated 4 out of 5

    Web Customer

    good product ..

  26. Rated 4 out of 5

    Customer

    good product ..

  27. Rated 5 out of 5

    RJ

    I got this for my Black & Decker CST1200 12-Volt 10-Inch Cordless Electric Trimmer/Edger (which is now discontinued). It works great, my old trimmer has come back to life!!!

  28. Rated 5 out of 5

    Scott Nelson

    Very good battery my trimmer work as good as new.

  29. Rated 5 out of 5

    John Ehrgott

    Works great, fast shipping!

  30. Rated 5 out of 5

    John Ehrgott

    Works great, fast shipping!

  31. Rated 5 out of 5

    Orvil Sutton Jr.

    I installed and charged over night and went to work. Thank you

  32. Rated 4 out of 5

    Fred brockmeier

    Received it in two days put it in and it works fine. I was expecting it to last a little longer but that may just be the way it is. As always shopping on was a pleasure. If you need a battery like this I would recomend this one, like I said the four stars is about the run time and it’s probably normal.

  33. Rated 4 out of 5

    Steven

    worked as expected.

  34. Rated 5 out of 5

    vincep

    Works good so far.

  35. Rated 5 out of 5

    MacroMan

    The battery was shipped quickly and in great condition. Easy to install and works great. I would buy from this seller anytime! I gave it 5 STARS to tell others this one is GREAT!

  36. Rated 3 out of 5

    ken strickland

    Seemed to work well initially but wouldn’t hold a charge. This may not be product related, but I’m powerless in St Louis

  37. Rated 3 out of 5

    ken strickland

    Seemed to work well initially but wouldn’t hold a charge. This may not be product related, but I’m powerless in St Louis

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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