Hey guys, I've been getting mixed answers from different sources, so I figured I'd come to you all!

I have a 55lb thrust Minn Kota Endura (transom mount). At the store near me they have a 75ah / 90ah / 105ah.

The 105 is Massive, the size of almost two of the other batteries.

The 90ah is fine, but I'm concerned it's not enough?

How many hours do you guys think I can run this trolling motor for? This is my only form of transportation as I have no Outboard for now.

It has 5 speeds plus 3 reverse. I figured I'd run it in 3 most of the time and only 5 if I'm fighting wind or something.

Thank you in advance,

David

i would buy as many AH as you can afford. You cannot really have too much battery capacity but it is a real pain to have too little!

A friend of mine just bought a commercial battery....golf cart battery I think it is...but anyway it is 120 AH and half the size of my 80 AH. I am not sure how they do that...or how much it costs...but I think I am going to look into it.

Of the three you mentioned, I wouldn't buy any of them.

I assume you have a 12v system. If so, they take more amps than a 24v so you need as many as possible.

If your present supplier doesn't have batteries with more reserve amps then go somewhere else. You can find 27 series deep cycle batteries in 200 + reserve amps. The general rule of thumb is a trolling motor uses about 1 amp per pound of thrust so you could be in trouble with smaller RAH batteries.

The additional cost is not much since a good battery will get you back to the launch with having to paddle.

If you are using a small boat that you have to load and unload from your truck the TM should push it quickly without using too much juice.  And lifting the oversize battery is no fun.  

I have a 14 ft fiberglass boat with a 60hp motor and my 45 lb will run for more than 6 hours on a normal sized AutoZone deep cycle battery (can't remember the Ah).  I transfer this battery to my john when I use it and I'm glad it's not any heavier.  

If you have a larger boat and are doing a permanent instal than get the bigger one just because.

Get a charger with auto shut off and trickle charge.  Always charge your battery ASAP after use and check the water levels every now and then.  

i would buy as many AH as you can afford. You cannot really have too much battery capacity but it is a real pain to have too little!

A friend of mine just bought a commercial battery....golf cart battery I think it is...but anyway it is 120 AH and half the size of my 80 AH. I am not sure how they do that...or how much it costs...but I think I am going to look into it.

I agree buy the biggest you can afford.

That golf cart battery may be six volts. Does he have 2?

The trolling motor will be pushing a 12ft Zodiac ( Inflatable boat ) .

I will be unloading it every time, thus the size concern.

i would buy as many AH as you can afford. You cannot really have too much battery capacity but it is a real pain to have too little!

A friend of mine just bought a commercial battery....golf cart battery I think it is...but anyway it is 120 AH and half the size of my 80 AH. I am not sure how they do that...or how much it costs...but I think I am going to look into it.

I agree buy the biggest you can afford.

That golf cart battery may be six volts. Does he have 2?

no it is12 volt...dont know if it were a golf cart battery or not for sure...that was just the only commercial battery that came to mind.

The 90 AH will be plenty enough to push your Zodiac around all day.

The 90 AH will be plenty enough to push your Zodiac around all day.

Thank you Mike, that's what I ended up getting.

The 105 was $170, the 90 was $110.

The 90 AH will be plenty enough to push your Zodiac around all day.

Thank you Mike, that's what I ended up getting.

The 105 was $170, the 90 was $110.

WOW where do you buy your batteries?    I get 200 reserve amp batteries for around $80.

If you try to run that motor at full speed for 1 hour, you will be paddling home.

I used the battery  / motor on Saturday.

Fished 7 hours, used the trolling motor 90% of the time, it was windy as hell and I had the motor on almost the entire trip.

I got home, put it on the charger, the battery had 1/4 life left in it.

I used it on top speed for a while as well. Probably an hour all together of full speed, and then the rest of the time 2-3.

Guess that's not too shabby.

Brokejew, glad I could help.