Trolling motor batteries, what are the best to buy?
The big advantage of AGM is that you can lay them on there side or up side down, so if you don't need to do that???? Do you really need them? Some say AGM batteries are more durable but the manufactures don't make that claim.
Deep Cycle Batteries for boats should last 7 to 8 years. Taking care of them correctly is the key.
1. Make sure you get a battery that is made for what you are using it for, the letters and numbers on them mean something and not every battery is made for the same thing. Call a service tech from a manufacture and tell him exactly what you are doing and he will recommend the correct battery. You can find these numbers on-line.
2. Always charge them after every use.
3. Make sure the fluid levels are good, and add distilled water when they go down.
4. Make sure you are using a charge that is made for the type of battery you are using.
5. If you have a 24 or 36 volt system (always disconnect the circuit when you are charging the batteries).
5. In the off season store your battery fully charged in the coldest environment you have. This will slow down the chemical reaction of the Acid and Lead so they last longer. There are colder places than the basement.
6. If you have an onboard charger that automatically shuts off you can leave it plugged in all winter. But will you be there to unplug it in the event of a fire???? Plus you really shouldn't have to leave them plugged in.
Like others have said, Interstates are good but so are Northerns.
Good Luck and have a good day.