Mighty Max 12V 100AH Rechargeable Battery - Ideal for Automotive, RV and Marine Use

Jennifer Moniz: I bought this as a second battery for my 44lb thrust trolling motor and it lasts so long I only bring the one battery with me now. I’ve had multiple days that I’ve spent 8+ hrs on the lake and at the end of the day it still has about a 35% charge. I’ve used it on both my 12ft Jon boat and on my 8ft pond prowler as the only motor and it works fantastically. I can’t speak to longevity as I’ve only owned it since May of this year (it’s July as I write this) but so far I’m very impressed my old battery only lasted 4-6hrs this one I’ve gone over 8hrs and the lake I fish is 1700 acres so I spend a lot of time driving yet it still has plenty of charge by the end of my trip.

United States on Jul 11, 2023

aaronaaron: I have 4 of these batteries in a 24 volt 200 amp hour configuration. I charge them with 6 100 watt solar panels and have had no problems. They have been running my radio room (the ham shack) for over a year now. They run my lights, weather station, 3 BF-F8HP's, my IC-7300, my IC-2730A my MFJ Versa Tuner V my MFJ SWR/Watt Meter, my MFJ 25 Amp Switching Power Supply, a Space Heater and my Computer with 2 Monitors. I only plug My AL-811H Amplifier into the wall for obvious reasons. They charge plenty on cloudy days to keep me going and fully charge on sunny days. I'm very Happy with them.

United States on Apr 02, 2022

Bryon Hush: Bought 2 and they performed to specifications, have a low voltage disconnect set to turn off load at 35% and calculating Amp/Hours and at low voltage disconnect I did get 65 Amp/Hours (Ah) of use.

To ensure battery longevity you should only discharge down as low as 11.8 volts (35%) and battery should last for a long time.

I have another brand of battery made by Alpha Cell, model GEL 210 GXL that have a date code from 2007 and they are still in service with 85% capacity when tested recently. The battery will last as long as you treat it.

Not using a low voltage disconnect on any deep-cycle battery will shorten the life dramatically if battery is discharged below 35% (11.8v) - So the low star reviews that claim the battery does not perform well likely have ran the battery below 35% frequently.

Hoping this 3rd battery I just ordered is as good as the first 2 Mighty Max 100Ah batteries I have had in service.

United States on Nov 16, 2021

S Eckert: 3 years into use in a 400W + 200Ah solar system, the batteries are still just fine. One does discharge a bit faster than the other even though they have always been used in parallel. (removing the parallel connection shows a slightly different voltage) One of the batteries was weak when I received it, and was replaced with free return shipping. But that was then and this is now.

I'm going to build another, bigger, system and I noticed that even when sold by amazon.com these are not marked "Free Return". Just Free Shipping. I contacted Mighty Max and asked about returns... get ready to pay UPS for a 60 pound hazardous box if they're not right when you get them! Minus one star.

Here's what the manufacturer says as of Jan 2021: "As per Amazon's return policy, a customer has 30 days from the original date of purchase to return their order for a full refund. Luckily, the manufacture extends a 1 year warranty on all defective items. While return shipping is not included under the manufacture's 1 year warranty, our company does offer alternative options to our customers in order to lessen the burden of a return. When applicable, we ask that our customers reach out to us...

United States on Jan 25, 2021

Luke P: I ordered one more battery than I needed, and even though the order was about to be shipped, Mighty Max was still able to edit my order when I sent them just an email. Great customer service.
The battery is a little pricey, especially when I could get a much larger AH battery for the same price, but it is well worth it. This battery has left me satisfied for almost a couple of years now, with no signs of wear and tear, or breakdown.
The battery life is also another plus. It has a very long battery life. I was able to hook up 8-100 watt solar panels to a couple of nice 50 amp charge controllers, then to 3 of these Mighty Max batteries linked in parallel. From there they power a 5,000 watt modified sine wave inverter, which then runs a pretty large-sized refrigerator, a couple of computers, about 10 LED light, a medium sized AC fan, and a 52" flat screen TV. It keeps all of these powered for up to 5 days if there's no sun. Or during larger storms/ hurricanes, It kept a small tv up and a large fridge up and running for the better part of 2 weeks (we also had 1 AC fan running and 3-3 watt LED's running during that time, but we did turn off the lights and fan whenever we weren't...

United States on May 07, 2020