About the Gel batteries. I heard great things about them so I bought one. I went a bought a Yamaha 4 stroke and the dealer said that they do recommend them for outboards because of the charging system on the motor. He said that outboards do not have the right system to give them a full charge do to the memory in the battery. I called the Yamaha company to find out if this was true and they told me that was in fact that was the truth. So now I use the gell battery as a back up. I hoped this helps.