re: Lithium Trolling Motor Batteries

There are 2 drawbacks to lithium versus all others.

1) The discharge rate is basically flat, you'll go from full power to hammer dead. This is only a drawback if you are one that is accustomed to the drawing down as a warning with classical batteries where you can tell from lack of power to the TM that you need to take it easy because you are close to having dead batteries.
2) the price is still too high, they have come down significantly, but not near enough as a practical option for most of us.