MM-AUX12 Auxiliary Battery 12V 12Ah, 20RC, 200 CCA Rechargeable AGM Car Battery
MM-AUX12 Auxiliary Battery 12V 12Ah, 20RC, 200 CCA Rechargeable AGM Car Battery
MM-AUX12 Auxiliary Battery 12V 12Ah, 20RC, 200 CCA Rechargeable AGM Car Battery
MM-AUX12 Auxiliary Battery 12V 12Ah, 20RC, 200 CCA Rechargeable AGM Car Battery
MM-AUX12 Auxiliary Battery 12V 12Ah, 20RC, 200 CCA Rechargeable AGM Car Battery

$84.99

MM-AUX12 Auxiliary Battery 12V 12Ah, 20RC, 200 CCA Rechargeable AGM Car Battery

SKU: MM-AUX12 Category:
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1 Pack $ 84.99
2 Pack $ 159.99
4 Pack $ 299.99
When your vehicle’s systems demand dependable backup, the MM-AUX12 delivers. This AGM battery is engineered for real-world performance in real-world conditions.  With 200 Cold Cranking Amps and a 20-minute Reserve Capacity, it holds its own in cold starts and keeps critical systems running when the main battery is resting.
The sealed AGM design keeps it maintenance-free and spill-proof. It’s built to resist vibration and recover from deep discharges without skipping a beat. The MM-AUX12 is all about durability, consistency, and zero-nonsense power.
Whether you’re replacing a dead battery or upgrading to something that won’t quit, the MM-AUX12 is ready to go to work. No mess. No maintenance. No downtime.
This is power with purpose, and it’s ready when you are. Are you powered to the max?
Detailed Specifications: 
Voltage: 12 Volt 
Amperage: 12 AH 
Chemistry: SLA, AGM 
Battery Size: 5.93 in x 3.50 in x 5.75 in 
Weight: 10.50 Lbs 
Warranty: 3 Years 
Multi Packs Bundled Savings

1 Pack, 2 Pack, 4 Pack

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Excellent
Mighty Max Battery
Based on 3474 reviews
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John & Cathy
Arrived quickly. Even got a sticker with it.
Sean Chacon
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.
larry scervino
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
Paul Major
Item as described and perfect fit and arrived on time
Manny Jaramillo
Battery arrived in a good shape package strait to my door steps
Robin Lauer
Arrived just in time to power my generator here in the cold Maine winters. Excellent service!
Shutter Dog Homestead
Arrived quickly from WALMART.COM. Perfect size and proper placement in my generator. Installation was easy. Generator fired right up. Battery came fully charged.
Larry Geiger
New battery. Ready for cold weather!
Harmon Chandler
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
Carl Ruckinger
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

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