OK... I'm outfitting my next boat and have always used AGM 120 Ah batteries in the past. I'm strongly leaning towards Lithium now that the price is only 2-3 times the AGM route. The warranty on Lithium is up to 10 years with 5 year replacement, they are MUCH lighter, charge quicker, and have a much better power curve. Have any of you seriously researched them or are you running them? Looks like you can even get a single 36v battery instead of adding (3) 12v in series. www.lithiumbatterypower.com/collections/marine/products/trolling-motor-power-kit
Batteries+ has 105AH AGM 12V for $245 before a 10% discount. That’s about $750
The 36V Lithium in that site is $2400 - so it’s more than 3X and 40% less Amp Hours. And that before you buy the charger / monitor for several hundred.
I like the idea of less weight - curious on the real life-cycle reliability - and also am still on the fence in their safety... but the cost equation does not seem to be there yet.... and that’s comparing to AGM - much less wet-cell
I'll add one more factor to consider - replacement. My partner and I were fishing the FoM national championship a few years back. He had AGM batts on his sled, one of them died. We ran all over looking for a replacement. Closest one was 200+ miles away. No one closer in stocked them. Fortunately we had my sled, too. As fate would have it, I lost a TM batt on the second day of practice. I whipped into the local Wally World, took in the old batt and receipt, and the clerk in the automotive department gave me a brand new one no questions asked. Back in business within an hour.
I love the idea of lighter, longer lasting, etc but the cost plus logistics of replacing has caused me to stay w/ traditional wet cell batts. Airborne can get one dems just about any place.
Thank you both for the input. At the end of the day, I will most likely go AGM since my needs are fairly basic. A few things about Lithium I have learned from research:
- 60 Ah lithium vs 100 Ah AGM are comparable since lithium delivers usable voltage until it is nearly depleted - Lithium charges MUCH quicker so if you run morning and afternoon trips, you can have a full charge in a few hours - Unlike wet-cell, there isn't the requirement to keep your battery topped off. Leaving Lithium half charged for a month is not a problem - Lithium batteries can sometimes be repaired as the components are a bit more modular - The obvious space/weight
Mike... as far as AGM, I have always purchased the VMAX Tanks. You mentioned 105Ah AGM for 245 and a 10% discount. Can you let me know hat kind and where those are sold?