Those batteries at the septechnologies website sound ok, until you read a little more about them, and it says they're not recommended for use in temperatures below freezing. bummer

 

that's why Odyssey batteries are great. They can be used at -40*F.

 

Buy a good quality battery for the 600/700 with no pull start. Yuasa has a high performance sealed one out now.
Walmart and some auto stores should have them for less but i would want the best one i could buy for that model.