I have a Shakespear 44lb thrust and a much more expensive Battery it's a Halfords deep cycle I should have a 115AH but in the interests of carrying I took the 75AH , it does me and its much easier to carry down to the loch, I can usually get about 4 hours useful fishing out of it, a, nd a run home, this is pushing a 14ft Pioner, so its not the most streamlined of boats, it would probably do better on a good Keel boat,I looked into Lithium batteries, But my Bro' in law ( golfer) got one for his cart, it was nearly £400, a bit out of my pocket,some one on you tube made a lithium battery up with model packs these were fitted into a tupper wear box and were a lot lighter than the lead acid , Derek Roxborough