I am thinking of converting my trolling motor battery overt lithium. I have A 24 VOLT MinnKota with spot lock etc.

I have heard that I only need a 50AH 24 volt battery? But I am concerned that is not enough and should get a 100 AH?

Any help appreciated.

All depends on how you use it. What size are your current batteries and how long do they last.

Two 31 Class Interstates. 80 # thrust 24 volt MinnKota. Running a full day on spot lock in the wind.

If you run full days I’d go with 100a as the 24v draws more amps than the 36v.

I have 2 100ah Ionics hooked to 24v trolling motor and 3 fish finders. I have fished 3 full days before I had to charge again. Still had over 20% left. Makes it nice if you go camping with no electricity available.

So you have 2 100AH 12 volts linked together rather than 1 24 volt ?

Yes sir.

Thank you for the details

A standard 12v Lead Acid battery is about 100Ah, but it's 50% efficient. For 2 lead acids you have 100Ah of effective capacity and it degrades with cycles pretty quickly.

Lithium is about 98% efficient. So you'll have a 24v battery with 50Ah, which is the same wattage as 100Ah at 12v.

If that made any sense, you'll have the same capacity as your two lead acids but much longer cycle life.

I have 2 29s and wish I could run the spot lock all day in the wind. Half a day is a stretch depending on how I run the TM. When I get close to a spot that I think is holding fish I will drop the TM and do some scouting to avoid spooking fish. I also run a small splasher motor. Switching to lithium next spring and I think I will go with 2 100a.

I have 2 Ionic 50's running a 80 #-24 volt Ultrex have never run them down lower than 50 percent fishing all day. I would buy them again ,they work for the way I fish.

Looking at prices on Lithiums today. Big jump from 50 to 100a. Trying to figure out if I really need the 100s for running the 24v TM half a day on spot lock in the wind. Money is not a big deal just hate to spend more then I need to. Also wonder if it makes sense to run a 50 and a 100 since one will run the splasher motor.

100's are the equivalent to two 50's so hence being almost twice the price. As for what size you need, 24v TM's actually draw more amps then the 36v. If your the type to fish all day or do tournaments then definitely go with 100's. For a casual user only going out a few hours at a time the 50's will be fine.

I fished 5 days at Texoma last week. Winds 25-30 with gusts a little higher…6:25-3:00. Combo of spot locking. Bank beating, and cutting across an around docks. The lowest the two Ionic 50Ah 12 volts got was 38%. Averaged around 45% left. I have a heavily loaded boat with an older Ultrex and an inefficient Weedless Wedge prop. With a 10 amp charger, it didn’t take that long to bring them back to 100% charge after I got back to the cabin.

I think two Ionic 50Ah 12v batteries is plenty for most people using a 24v troller on an average boat.

With the rising costs of a standard lead acid battery, or an AGM, combined with their poor performance to weight and shorter lifecycle…Ionic batteries are the deal of the century!