>>Toshiba announced earlier this year that it will start shipping >>methanol fuel cells by the end of 2005. This I heard on Discovery Toshiba also recently (within the last few weeks) demonstrated a lithium ion battery that can recharge 80 per cent of its power in just 1 minute, and can recharge fully in 3 minutes. It keeps more than 99 per cent of its original capacity even after 1000 test cycles of discharging and recharging. This comes on the heels of another lithium-ion (Li-ion) battery from Altair Technologies of Reno, Nevada, that recharges in 6 minutes (New Scientist, 5 March, p 27). http://www.newscientist.com/article.ns?id=mg18624946.400 (You may need to be a subscriber to read the full story) Toshiba says it will commercialize a larger form of the battery next year, for industrial and automotive applications, including hybrid cars and batteries for emergency power supplies in plants and hospitals. Which begs the question: How long before we see a vhf battery that can be recharged by turning a crank for 3 minutes? ;) Woody *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
"Robert Woodard" <woody_at_kayaktrips.net> > Which begs the question: How long before we see a vhf battery that can be > recharged by turning a crank for 3 minutes? ;) That gave me a chuckle! I have not done the complete calculation, but I bet I'd have to be a lot buffer to get the equivalent of 1400 mAh out of my arm in three minutes! I think that's about 84 Joules ... or about (84 J) / (180 sec) = 0.47 W. Seems awfully low. I bet I did something wrong! Of course, it could always be ... crank to talk ... now that would knock the cell phone minutes down a bit on my son's cell phone! -- Dave Kruger Astoria, OR *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
On 11 Apr 2005 at 13:08, Dave Kruger wrote: > That gave me a chuckle! I have not done the complete calculation, but > I bet I'd have to be a lot buffer to get the equivalent of 1400 mAh > out of my arm in three minutes! If it's 7.2v (pretty typical of VHF radios), then that's 1.4*7.2 = 10.08 watt-hours = 605 watt-minutes. To do that in 3 minutes is 604/3 = 201 watts or about 0.27hp. That's about maximum paddling arm power for three minutes. Phew! More if the crank is less than 100% efficient. Charging voltages are higher and losses are not trivial (though small), so it's likely more like 0.4hp. How about a partial recharge instead? :-) Mike *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
On Monday 11 April 2005 21.45, you wrote: > Toshiba says it will commercialize a larger form of the battery next > year, for industrial and automotive applications, including hybrid cars > and batteries for emergency power supplies in plants and hospitals. > They will be hot stuff among model flyers, unless their chargers are very costly! Tord *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
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