I have a Battery Tender Plus trickle charger that I've always used for my motorcycles and atv's.  Now that I have a boat will this charger do the trick or do I have to get a bigger charger designed especially for Deep Cycle batteries.  Thanks

it should be fineif your trickle charging

Even if you have the 3 amp BatteryTender, it's not big enough to charge a deep cycle trolling motor battery. Too small of a charger will not charge fast enough to create the gas bubbles necessary to prevent stratification. The bubbles rising to the top keeps the electrolite mixed from bottom to top. The recommneded charge rate is 10% of your batteries amp hour rating. As a minimum the charger needs to be large enough to charge the battery to a full charge at least in 8 hours. In most cases an 8 - 12 amp will work fine, anything less than six amps is kinda pushing it.

It is a great maintainer to leave on a TM battery after it has been fully charged.  I use them on my batteries that I don't have onboard charges hooked to.

Thanks, that's what I figured.  I guess I'll have to spend some more money.  lol