Trolling motor batteries

What batteries are you using and do you like them?

Background: The lead acid batteries that came with my used boat wouldn't hold a charge so I replaced them with a pair of 100 Ah LiFePO4 batteries. One is from Ampere Time and the other is from Li Time, which as far as I can tell is the same company.

They worked great for a year but now the Ampere Time is malfunctioning. My NOCO charger starts to charge it, but after a minute, it goes dark as if it isn't even connected to a battery. Then it goes back to charging for another minute. Back and forth. Eventually it shows a full charge. The NOCO charges the other battery steadily with no disruption.

Switching batteries to the other NOCO circuit shows the problem is in the battery, not the charger.

With the batteries wired in series, I get 24 volts to power the Minn Kota and it works fine for a few hours. But then the Minn Kota dies and won't come back on until I recharge. When the batteries were new, they ran the Minn Kota for 12+ hours. Judging by the charging time of the good one - the Li Time - I think the bad one - Ampere Time - is just shutting off before it is depleted.

The older of the two batteries is less than 3 years old with maybe 50 charges in its life. Still supposed to be covered by the warranty. Emails to Ampere Time Support have gone unanswered so it looks like the warranty will not be honored. So I'm looking for a better brand and will appreciate your input.

I went with the TimeUSB LifeP04 140 ah battery because alk the reviews were great especially for after the sale help. My MK is a 12v unit so the one 140ah runs my motor for an easy 8 hrs. I have a dedicated factory charger for my battery and it also has the monitoring system that works off my phone thru bluetooth. Tells me everything, whether it is charging correctly, how long until done, current draw while in use and how long it will still run etc. Would not buy another battery without this system ! Had some difficulty getting connected at the beginning but TimeUSB was very helpfull, called me everyday to make sure things were working properly. From others I have talked to they do honor their warranties....no complaints, would gladly buy again. 140ah same size as a group 31 lead acid and lasts longer than two new group 31 batteries. This battery was the same cost as buying two new lead acid batteries but lasts almost twice as long. I ordered directly from TimeUSB at same cost as you could get anywhere. So far great people.
It is recommended that both batteries be the same type and age when wiring together ! Batteries need to be balanced together when first connected together ! Lipo type batteries are great, but need to be handled properly without exception or serious consequencies can happen including instant white hot fires !

I bought 2 Dakota lithium 12 volt 100 amp hour batteries a couple years ago. Love em so far. This spring I had an issue with one of my batteries not taking a charge. Basically I ran the batteries until they shut down. I got back to the camper and charged one battery with no problem. However the second battery wouldn't charge. It was as if the charger didn't even know it was hooked up. I called Dakota lithium customer support and talked to the guy. Described to him what was going on. After a short conversation he asked for my name and address and sent me a new battery at no charge. However the next day I decided to try charging that battery again and this time it charged right up. Haven't had a problem since. Haven't even installed my new battery yet. I was pleasantly surprised by Dakotas customer service.