Mighty Max Battery ML18-12 Deep Cycle Battery Review

Mighty Max Battery ML18-12 Rechargeable Deep Cycle Replacement Battery Review

You may be looking for something to power your amateur radio or water craft or maybe something to run the lights in your workshop. If you need a good rechargeable deep cycle battery, there are quite a few different options available.

The number of choices can take some time to consider, but we have tried to make the process easier on you (and your wallet). Some of the best options are sealed lead acid batteries of the AGM variety (Absorbent Glass Mat) because you can use them in thousands of different ways.

In this review we take a look at the Mighty Max ML18-12 rechargeable deep cycle 12 Volt battery and take it through its paces. It is a deep cycle battery, but it is a sealed lead acid battery and is fully rechargeable.

Unlike older lead-acid batteries, it is a sealed AGM battery so you don’t have to do any maintenance like filling it with distilled water. It resists shocks and vibration and can be mounted in different positions and orientations. It has a nut and bolt terminal and comes with a 30 day refund policy. It has an amperage of 18AH and works with a calcium alloy grid.

That covers the features, but we will also give you a few of the pros and cons, so you can quickly decide if this battery will suit your needs. We will also give our verdict if you need a second opinion before you buy a new battery.

Mighty Max Battery ML18-12 Rechargeable Deep Cycle Replacement Battery Features

  • The battery is a sealed lead acid (SLA) and AGM (Absorbent Glass Mat) type
  • The battery is fully rechargeable and free of additional maintenance
  • It can be mounted in any position
  • It resists shocks and vibration
  • It performs well in high and low temperatures
  • It has a nut and bolt terminal
  • It can be used in float or cyclic applications
  • It works with a calcium alloy grid
  • It comes with a 30 day refund policy and 1 year warranty
  • It is made in China
  • The voltage is 12 Volt with an Amperage of 18 (AH)
  • Dimensions: 7.13 x 3.01 x 6.57 inches (18.11 x 7.64 x 16.68 cm)
  • Weight: 11.9 lbs. ( 5.39 kg)


  • This battery works well for small crafts and for on and off operation for a day or so
  • It works well for a large range of different applications, from water craft, lawnmowers and generators to ham (amateur) radios
  • It charges quickly with 18 Watt solar panels
  • It has good power for its size
  • It is very reasonably priced
  • It is very shock resistant


  • The battery does not have any labels to indicate the voltage or amperage
  • The terminals are very thin and will be difficult to connect for testing reports
  • After around 5-7 months it starts losing the charge quickly


Whether you need a battery for a trolling motor, a ham radio, water craft or your tennis machine this sealed lead-acid battery by Mighty Max is right up to the task. It is a solid versatile battery with a very wide range of applications and can be mounted in almost any direction.

It also recharges very easily and quickly, even with 18 Watt solar power panels. It also works well for an entire day of on and off operations and is well suited to smaller water craft or four wheelers (ATV’s). It can also handle quite a few knocks and shocks. On top of that it is reasonably priced so it won’t break the bank, you could eve buy two.

On the negative side, there is not too much to say. The labelling on this battery is a little sparse and if you have a few different batteries in one place you might have trouble remembering exactly what the voltage and amperage on this one is.

If you use it heavily for around 6 months, it can start to lose the charge very quickly. The terminals are also quite thin, so if you want to connect it for testing reports you can have difficulty.


This mighty max battery has a set of pros in its favor that really outweighs its negative side. It is priced well for what it can do, it does not need any maintenance and is nice and compact. It is powerful for its size and can be recharged with alternative methods, like solar panels.

It is suitable to marine applications, but can also keep your ham radio happy for hours. The terminals are thin, but should not be a problem unless you plan to test this battery often. Mighty Max has made a versatile and robust battery that you can easily use in a variety of settings.

Originally posted 2017-07-26 20:34:41.

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