Re: (ET) New Member

[Michael S Briggs <msbriggs alberti unh edu>]

I just wanted to chime in with some thoughts on this issue.
	My batteries (old T-105s) are pretty weak, but I'm not planning on 
getting new lead-acid batteries, since there *should* be some 
significantly improved Li-ion battery technologies coming onto the market 
over the next few years - which would be great not only for full electric 
vehicles, but also for ETs.
	By moving away from the lithium cobalt oxide cathodes (Co is very 
expensive (and somewhat toxic)), the cost can come down a fair amount. The 
most appealing replacement choice currently is doped lithium iron 
phosphate. The big improvement though comes from using solid electrolytes 
(either plastics or preferably lithium sulfide glasses), which can reduce 
the internal resistance (allowing rapid recharging), and eliminate the 
problems of both electrodes reacting with the current liquid electrolytes, 
the primary reason current Li-ion batteries generally only last a few 
years (so the new ones should last much longer). So - lower cost (no Co), 
low internal resistance (high efficiency and rapid recharge), long 
lifetime, and much better safety (it is the liquid electrolyte that 
presents the fire hazard in current Li-ion batteries).

Mike

--

--------------------------------------------------------------
Michael S. Briggs, PhD
UNH Physics Department
(603) 862-2828
---------------------------------------------------------------

On Wed, 2 Jul 2008, SteveS wrote:

> Congrats on the purchase.
>
> Don't use deep cycle marine batteries. They will not last. You want Golf
> Cart batteries.
>
> If you have a Sam's Club, they have golf cart batteries (Costco doesn't
> seem to carry them). Last I checked (in VA, USA) they were $60-something
> US. They are re-branded and come from different manufacturers. I have
> not used them, but others have and I think results are mostly positive.
> Certainly cost effective.
>
> Battery prices have really gone up in the past year. I was going to buy
> a set this year, but decided to baby mine a bit more in hopes that lead
> prices (and hence battery prices) go down.
>
> - SteveS
>
> David Haas wrote:
> > Hello all, I have a new idea egt200 I just picked up last month with a
> > mower deck snow blower and a real egt power inverter the rotary type
> > that plugs into the accessory outlet it was all working when picked it
> > up the person I bought it from lifted the blower with the egt and
> > backed it on the trailer so it was all working but the deal did not
> > include that Batteries as he wanted them for his golf cart so now Iam
> > in battery shock Iam located in Ontario Canada and the cheapest
> > batteries I can find are $137.00 each and there is a 6 month wait list
> > for used or rebuilt batteries  and they are $60.00 each when there
> > available I have checked the local gulf courses and there all spoken
> > for the guys up here use them for there electric trolling motorsI am
> > in a big fishing area by lake Huron and George bay .
> > Any help by local ET owners would be appreciated
> > PS would deep cycle marine motors work Canadian tire has them on sale
> >
> > Thanks David Haas
> >
> >
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