Mighty Max ML35-12 is a 12V 35Ah deep cycle, sealed lead acid (SLA) AGM battery, suitable for use in a wide variety of applications like power sports, solar, electric vehicles, cranking battery, golf carts, lawn and garden tools, security etc.
Although it is designated as 'deep cycle' battery, it is often used as dual purpose battery on small boats, and in lighter vehicles with internal combustion engines.
Mighty Max ML35-12 is maintenance free battery, which can be safely mounted in any position, has increased shocks and vibrations resistance, thanks to its SLA-AGM design.
Mighty Max ML35-12 is advertised as having 'high discharge rate, wide operating temperatures, long service life and deep discharge recover', however, we couldn't find any discharge rate charts or tables and no CA, MCA or RC ratings on the official Mighty Max web site.
Nonetheless, the battery is very popular because of its relatively light weight and small dimensions, acceptable price, good warranty conditions and perhaps the most important, the battery has shown to be reliable power source in all kinds of situations - as starting battery for small petrol engines, as dual purpose battery, as deep discharge (trolling) battery, in stand-by or cyclic use etc.
Mighty Max ML35-12 nominal voltage is 12V and 20h capacity is 35 Ah - hence the name ML35-12.
Battery is 7.68 inches (19.5 cm) long, 5.16 inches (13.1 cm) wide and 7.13 inches (18.1 cm) high and weighs 23.15 pounds (~9.6 kg).
Battery terminal type - nut and bolt. Also, ML35-12 comes with the plastic handle, so it is easily carried around.
Mighty Max ML35-12 as a Trolling Battery
Mighty Max ML35-12 nominal capacity is 35Ah - it can supply 1.75 A current, at 80°F (~25°C), for 20 hours, without voltage falling below 10.5V. When supplying much larger currents, nominal capacity drops, especially when being discharge with larger currents.
Note that even small electric trolling motors require plenty of amps - for example, Newport Vessels 36lb Thrust NV-Series electric trolling motor draws ~30A at full throttle. Such load would fully discharge Mighty Max ML35-12 battery in less than an hour.
To preserve the SLA-AGM batteries, they should never be discharged down to 20-30%, preferably 40% of their capacity.
Considering all of this, if you plan on using 30-40 pounds electric trolling motors at full throttle with ML35-12 battery, don't expect more than 30-40 minutes of operation. However, most fishermen using fishing kayaks or other similar smaller boats, don't operate their electric trolling motors on a full throttle all the time. Decreasing the power, required current is decreased and thus operating time is extended.
Depending on the fishing conditions, size of the boat, and fisherman's habits, this operating time can be up to, or even more than 2 hours.
But, worst case scenario, 30-40 pound electric trolling motor can discharge ML35-12 battery in 30-40 minutes.
Mighty Max ML35-12 as a Fish Finder Battery
Mighty Max ML35-12 can be used as a high-capacity Fish Finder Battery.
Most fish finders for small boats and kayaks draw around or even less than 1 Amp of current. Larger fish finder/GPS combo units can draw more than that, but on average around 3 Amp.
So, if you plan on using ML35-12 battery as a fish finder battery, be sure to find out how many amps your device requires.
If it is small fish finder, MP35-12 battery will power it for at least 35 hours. If it is larger unit, expect around 10 hours of operation.
Again, to preserve the battery, be sure not to discharge the battery fully.
Charging the Mighty Max ML35-12 Battery
Mighty Max ML35-12 can be charged like every other SLA-AGM marine battery, just be sure not to charge it with too strong current - to preserve the battery operating life, smart battery charger is recommended.
Such battery chargers check the battery first and depending on its condition and state, charge the battery using the best possible charging mode.
Long story short - Mighty Max ML35-12 deep cycle battery is excellent small SLA-AGM battery. It has shown to be tough and durable, but unfortunately its manufacturer Mighty Max doesn't provide battery's exact discharging rates and charts.
Mighty Max ML35-12 can be used as small deep cycle or dual purpose battery, and it can be used even as cranking battery, for really small petrol engines.
For more reviews and recommendations, check Mighty Max ML35-12 SLA AGM Battery Amazon link (link opens in the new window).