Batteries - What does "group" mean

[KG's Supra24]

Now time for Battery 101 ...

With all this battery talk. What exactly are we looking at? What are the different sizes and "groups" we should be looking at? Crank and Accessory?

[EarmarkMarine]

'Group' means a size classification. However, its a little tricky. With a Group 24, 27, 29, 31, etc. the capacity gets progressively larger. A Group 34, Optima for example, is actually smaller than a Group 24. The Group 34 will fit a Group 24 case with lid but since it is not as tall it gets to be more work to fit it into a Group 24 tray and bracket. Factory Moomba uses Group 24 provisions.
Use the 'Group' for a reference to mounting. A Group 31 is still a manageable size and weight. Batteries with greater amp/hour capacity are generally larger but definitely heavier. Focus on the maximum amp/hours.

David
Earmark Marine

[cab13367]

Now time for Battery 101 ...

With all this battery talk. What exactly are we looking at? What are the different sizes and "groups" we should be looking at? Crank and Accessory?

The group refers to the physical size of the battery. Best bang for the buck is the Group 27 marine battery at costco. It's rated at 115 amp-hours and cost $69 each. You can spend a whole lot more money for batteries and not get much more performance.

[dusty2221]

This build is going to be the death of you an I.

[KG's Supra24]

This build is going to be the death of you an I.

So I'm pretty sure we are going to need that third battery for the trolling motor.

[sandm]

kg, only if you have the optional hotshoe for the troller. if it's hand-operated, you're golden

[Razzman]

You two on overload yet?