So I think I am experiencing the same problem as Bubb2 above has conquered. My first starting battery lasted 3 years, the second 2 years, and the 3rd 2 years. Wheras my deep cycle 6vx2 batteries have lasted 6 years. The starting batteries seem to be very hard to keep over the winter, despite using one of these impulse type devices.
So I am considering using a deep cycle or maybe a combined deep cycle/starting battery for starting. I am going to investigate my starter, but in the meantime, how many amp hours deep cycle battery do you think would be needed for starting a 25HP diesel engine ?
Thanks very much.