Thread: Info on AGM batteries and chargers

Good to know
Guess ill stick we Walmart batteries every 5 years or so

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I guess if the batteries and chargers go bad at the same time it would makes sense to replace everything. But that would hurt the pocket bookj

I'm in my second year running AGMs with a three bank 10 amp charger. (MK 330 D) I have had no problems at all. Two group 31 on the trolling motor and a
group 31 cranking battery. The only thing they told me was to leave it plugged up and never let it run down. I got my information from the battery dealer and
Minn Kota help line. Not letting it run down meaning never let them get completely drained.

Actually I've been using an 8 amp Stankey Fat Max Smart Charger for the last year with no problems . Only reason I got on this adventure is I got some water in my boat and it shorted out my unit which was under the seat. It wasn't plugged in, I was on the lake when this happened.
I figured I should get a waterproof one to avoid a repeat and now all this.
I'm pretty sure the Stanley charged at the same rate as this Promariner I bought. Now that I know it won't do any damage to the AGM, I may just hook it up and use it. It gets boosted by the outboard alternator when it's running as well.

If not mistaken the 330D can be set for all types of batteries (gel, AMG, acid). ?!?

Probably so. The BPS on board charger on my 02 Tracker had a switch for either type. Guess that's why this one was only $70.

Maybe it depends on the particular Promariner charger and the particular AGM batteries. I have a Promariner (Cabela's) 3 bank charger and all AGM batteries that have worked well for several years now. The manual for the charger says to use the lead acid/AGM mode. This charges at 14.6 and floats at 13.4. For me it has worked well and my batteries fully charge according to the indicator on my trolling motor. I seem to get pretty good life from them even when I troll for hybrids/stripers at close to 2 MPH. They do have a charger with a specific AGM high performance mode that charges at 14.7 and floats at 13.6 and it says it is for Optima, Odyssey, and West Marine brands. The profile for GEL batteries with Promariner is charge at 14.1 and float at 13.8. Sounds like the tech guy did not agree with what their manual says.

This is a new inexpensive model .It states in the owners manual that it is not suited for AGM batteries. I didn't know that until I read the owners manual. Anyway, I'm swapping it for a MinnKota digital chargers that is designed for AGM batteries.
Ironically, the charge and float rates for the MinnKota are identical to the ProMariner. Having majored in Engineering in college and spending 32 years in the industry, I'm beginning to detect a lack of knowledge in this whole process.