Hi John,
The high power density, low Peukert effect losses, high charge/discharge rates, and (projected) high cycle life of lithium comes at a high cost.
If you need these characteristics, they might make economic sense.
But not every electric boater needs to spend the bucks for this level of performance.
You can do much better than the price you were quoted.
You'll find that 4 ea of 3.2V 200AH Winston ( ex-Thundersky) cells will weigh about 64 lbs for about $750, plus shipping.
-Tom
--- In electricboats@yahoogroups.com, "john_casperson" <john_casperson@...> wrote:
>
> The target weight for a boat I am constructing is 300 lbs, so it can be dragged up on the beach.
>
> I asked a vendor for a quote on a 12V 200 Ah Life battery. He asked what I wanted it for. I told him to replace a pair of Wal-mart group 29 deep cycle batteries and save 100 pounds in weight. He then recommended
>
> "My take on your project would be to use (1) 12V / 30Ah LiFeBATT Lithium prismatic cell battery. Cost = $ 550.00 plus $150 shipping. Weight = 13 LBS."
>
> A 12V 45Ah lead acid battery weighs the same as what he quoted, and only costs 1/5 to 1/4 as much. If I wanted woefully inadequate capacity, I'd do that.
>
> What are these batteries for?
>
> John Casperson
>
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