Re: Trolling Motor batterys ?
No matter what battery you decide on, and price will most likely dictate that for you, you can really extend the life of the battery by making sure to recharge as soon as possible after use.
Also, if you get a traditional flooded cell lead acid then routinely check the water levels and refill as necessary (wear gloves and eye protection!!!) with distilled water. If you aren't rushed for time between uses you can really cut back on the amount of water that is "boiled" out during your recharges by getting an intelligent charger and cutting back to a 2 amp charge. Not only is this better for the battery in the long run, but it will help keep the water in it.
If you have the money you can check out newer AGM (absorbed glass mat) batteries. These are pretty much maintenance free and can laid on their side, etc with no worries of liquid spillage.
Once again I cannot stress enough ... RECHARGE ASAP AFTER A DISCHARGE!!! In the winter months or when your boat has sat for awhile w/o use go ahead and hooked that charger up for a little refresher.
Life is too short to lose good fish.