How Much Battery?

[Crestliner2008]

I'm picking up a MK 40# thrust TM, with transom mount. I'm planning on using this small motor between two boats for side pulling and trolling. Not looking at running all day long. Thinking about 2 - 3 hrs. run time on mid speeds at most and I'll be happy. Because I'm planning on moving this motor (and battery) between two boats during the season, I'd like to get the lightest battery possible - weight wise. Besides, at 73, trying to move a 60 lb. battery back & forth between the boats is not a viable option. I'm thinking something along the lines of a series 24 or 27 deep cycle, but I'm not sure of the weight of these batteries. What can I get away with and still have enough juice to run this motor? Thanks for your input folks!

[WRB]

You need a marine deep cycle battery regardless how long it's being used and 3-4 hours  is enough to discharge a good battery about 50% depending on how long and what power it's on.

group 24 weigh about 50-55 lbs, group 27 between 55-60 lbs depending on the quality of the battery. 

You might want to consider 2 batteries like 21R, 50 AH weight 30 lbs and wire them paralell.

Ion Lithium weigh 1/2 as much but costs over $500.

Tom

PS, I no longer try to remove my batteries and get help!

[Crestliner2008]

Thanks for your input! I really appreciate it. I try to keep myself in pretty decent shape, so I'm going down to the marina tomorrow and check how much a 24 & a 27 weigh. I think I can manage 50# with little difficulty, but we'll see. Thanks again.

[Angry John]

2 hours ago, WRB said:

You need a marine deep cycle battery regardless how long it's being used and 3-4 hours  is enough to discharge a good battery about 50% depending on how long and what power it's on.

group 24 weigh about 50-55 lbs, group 27 between 55-60 lbs depending on the quality of the battery. 

You might want to consider 2 batteries like 21R, 50 AH weight 30 lbs and wire them paralell.

Ion Lithium weigh 1/2 as much but costs over $500.

Tom

PS, I no longer try to remove my batteries and get help!

Lithium will seem cheap vise pulling a muscle or hurting yourself.  You could by two regular and not move the battery or one li and move it as you want.  I will spend a lot to prevent injuty.  Jmo

[Crestliner2008]

Interesting. Talking with a guy I know who works for the marina I usually buy at, he gave me a comparison. He pulled out two deep cycles; one 24 and one a 27. Now, as I've said, I'm kinda getting up there in years and I found no comparison between the two sizes - weight wise. The 27 was a heck of a lot heavier. Now I know.....it'll last longer, right. But, the trade off is indisputable for my purpose. I think I'll go with the 24 for this season and if it doesn't pan out, I'll reluctantly go one size up. Believe me folks.....getting old is no fun! LOL!

[Choporoz]

A couple years ago, I switched from Walmart Everstart 27's to Interstate 24's for my rental boat use.  Much lighter and, Bonus!...They last longer.   Peace of mind; and my back thanks me.

    I'd say that if you keep Interstate 24 Marine on charger when not in use, you'll have no trouble going 4+ hours at continuous mid-speed....

[Crestliner2008]

Thanks all for the feedback. I really appreciate it. Ended up getting the Interstate 24. Now all I need is for the ice to get the heck off our waters! Maybe next week!