The Mighty Max ML100-12 is a 12 V 100 Ah sealed lead-acid battery with AGM separators and a valve-regulated design. It is UL certified, maintenance-free and spill-proof, and can be mounted in any position. At $169.99, sold by Amazon.com, it is the cheapest 100 Ah lead-acid battery on this shelf.
A thin listing
The bullets describe a high discharge rate, wide operating temperatures and deep discharge recovery, without a single number to back them. Renogy gives a -4 to 140 °F range and a 1,100 A peak; UPLUS gives 710 A and 45 A continuous. Mighty Max gives neither.
The weight figure
The listing gives 28 lb. A 100 Ah lead-acid battery of 12.09 × 6.65 × 8.48 in cannot weigh that little: the Renogy AGM lists 63.9 lb and the UPG 60 lb at similar dimensions. Expect around 60 lb when you lift it.
What is in the box
The battery and its screws. No harness, no mounting hardware.
Price on Amazon.com
Amazon.com listed it at $169.99 on November 2, 2026, with a one-year warranty.
Prices quoted in this text were read on November 2, 2026. The live price is at the top of the page.
What it gets right, and what it leaves out
Strengths
The lowest lead-acid price here, $169.99, sold by Amazon
UL certified, and can be mounted in any position
Spill-proof AGM design for enclosed spaces
Compromises
A one-year warranty
The listed 28 lb weight is not credible for a 100 Ah lead-acid battery; the other 100 Ah AGM listings here give about 60 lb
No discharge or temperature figures in the bullets
Specifications
Capacity
12 V, 100 Ah
Chemistry
Sealed lead-acid, AGM, valve regulated
Size
12.09 × 6.65 × 8.48 in; Group 27 per the bullets
Certification
UL certified
Mounting
Any position; resists shock and vibration
In the box
Battery and screws only, no harness or mounting hardware
Weight
Listed as 28 lb
Warranty
1 year
Amazon reference
B00S2MDZFK
Questions owners ask about this one
Does it really weigh 28 lb?
That is what the listing says, but sealed lead-acid batteries of 100 Ah weigh about 60 lb; Renogy lists 63.9 lb and UPG 60 lb. Plan for the heavier figure.
Is anything included?
The battery and its terminal screws only. No wire harness or mounting accessories.
Can it be mounted on its side?
Yes. Mighty Max says it can be mounted in any position and resists shock and vibration.
Our score
8.0/ 10
A plain, UL-certified 100 Ah AGM battery at the lowest lead-acid price here. The listing is thin, and its weight figure is wrong or misleading.
Set beside the neighboring portable power units
Same category, nearby prices, between portable power units. What remains is the specifications every one publishes — half empty, a column is no use.
Where the models are not equal, in portable power units
If price decides: this model, at $170.
Highest Weight in the table: Renogy 12 V 100 Ah AGM (63.9 lb).
Who this one is for, among portable power units
Solar and backup banks where price matters more than weight or warranty
Sources
Specifications: the manufacturer sheet for portable power gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
12 V 100 Ah sealed AGM deep-cycle battery, 13.1 × 6.9 × 8.6 in, 63.9 lb, 1,100 A (5 s) maximum discharge, discharge from -4 to 140 °F, under 3% monthly self-discharge, unlimited series and up to 4P parallel, 2-year prorated warranty
A 12 V 100 Ah AGM deep-cycle battery that discharges from -4 to 140 °F, with a 1,100 A five-second peak and low self-discharge, sold by Amazon at $208.99.
Best for: Cold-climate RVs and cabins, and anyone who wants a sealed battery without a BMS
12 V 100 Ah lead-carbon AGM / gel hybrid deep-cycle battery, Group 27 (12.05 × 6.61 × 8.19 in), 80% recommended depth of discharge, 25 A maximum charge (full in 5 hours), 45 A continuous, 710 A (5 s), 60 lb, 2-year warranty
A 12 V 100 Ah lead-carbon AGM battery rated for 80% depth of discharge, with charging and discharge limits in amps, at 60 lb and $171.46.
Best for: Solar and RV banks where you want lead-acid but need to use most of the capacity
