You can also find MinnKota brand batteries at Dick's Sporting Goods. They are made by Trojan (says it on the label) and are essentially Trojan batteries at a slightly lower price. Right now, I have an Interstate Marine cranking for the engine and a Bass Pro Shops (Size 27) Deep Cycle battery for the trolling motor. Had an Interstate, but it crapped out after barely two years. BPS' batteries were on sale. Since then, the wife got me a new transom mounted trolling motor for doing double duty (rear of the PT175 and front of the 12ft Water Tender). I'll probably get a Minn Kota battery for that since I have a credit at Dick's. Of course there's also the Everstart batteries at Walmart with a price that can't be beat.
JC