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Posted by Jack's Wife, Murriel on April 4, 2007, 8:51 am
2 AA brand-name alkaline batteries will power my toothbrush 2 minutes
a day X 30 days= 60 minutes, tops. Actually, I see a power loss after
about 15 days (30 minutes total).
2 of the same type of batteries in a home exercise ski-machine to
power a monitor that shows time elapsed, calories, distance, and miles
per hour for 180 minutes a week are still in use after three months!!
2,800 minutes?!!?
Yet in a home-exercise air glider machine with a simpler monitor that
shows elapsed time and no. of steps, the readout starts to fade after
150 minutes.
Go figure, eh.
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Posted by Josh on April 4, 2007, 9:26 am
| 2 of the same type of batteries in a home exercise ski-machine to
| power a monitor that shows time elapsed, calories, distance, and miles
| per hour for 180 minutes a week are still in use after three months!!
| 2,800 minutes?!!?
The batteries are most likely not used to power the screen once you get
going. They're just there to provide micropower when the machine isn't in
use.
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Posted by Jim Yanik on April 4, 2007, 11:53 am
60.giganews.com:
> 2 AA brand-name alkaline batteries will power my toothbrush 2 minutes
> a day X 30 days= 60 minutes, tops. Actually, I see a power loss after
> about 15 days (30 minutes total).
Here you are running a electric motor,drawing lots of current,converting
electrical energy into mechanical energy.
>
> 2 of the same type of batteries in a home exercise ski-machine to
> power a monitor that shows time elapsed, calories, distance, and miles
> per hour for 180 minutes a week are still in use after three months!!
> 2,800 minutes?!!?
the current draw for the electronics in that machine is very low.
Probably CMOS logic.Maybe a LCD display?
>
> Yet in a home-exercise air glider machine with a simpler monitor that
> shows elapsed time and no. of steps, the readout starts to fade after
> 150 minutes.
>
> Go figure, eh.
>
LED displays draw more power than an LCD display.
--
Jim Yanik
jyanik
at
kua.net
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Posted by on April 4, 2007, 1:06 pm
On Apr 4, 8:51 am, Windswept@home (Jack's Wife, Murriel) wrote:
> 2 AA brand-name alkaline batteries will power my toothbrush 2 minutes
> a day X 30 days= 60 minutes, tops. Actually, I see a power loss after
> about 15 days (30 minutes total).
>
> 2 of the same type of batteries in a home exercise ski-machine to
> power a monitor that shows time elapsed, calories, distance, and miles
> per hour for 180 minutes a week are still in use after three months!!
> 2,800 minutes?!!?
>
> Yet in a home-exercise air glider machine with a simpler monitor that
> shows elapsed time and no. of steps, the readout starts to fade after
> 150 minutes.
>
> Go figure, eh.
Well, not knowing what the power draw is, can't do anything but
speculate. And comment that to use disposable batteries to power
a toothbrush shows the power of marketing over sense.
HTH,
J
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Posted by mm on April 4, 2007, 2:35 pm
On Wed, 04 Apr 2007 12:51:33 GMT, Windswept@home (Jack's Wife,
Murriel) wrote:
>2 AA brand-name alkaline batteries will power my toothbrush 2 minutes
>a day X 30 days= 60 minutes, tops. Actually, I see a power loss after
>about 15 days (30 minutes total).
Motion like this takes more than just moving electrons around, I
think. Apparently even LCDs only use a tiny bit to arrange the
crystals, and once they are in place will stay that way with no or
almost no current.
>2 of the same type of batteries in a home exercise ski-machine to
>power a monitor that shows time elapsed, calories, distance, and miles
>per hour for 180 minutes a week are still in use after three months!!
>2,800 minutes?!!?
>
>Yet in a home-exercise air glider machine with a simpler monitor that
>shows elapsed time and no. of steps, the readout starts to fade after
>150 minutes.
>
>Go figure, eh
I have an AMFM Clock radio from 1972 that uses two 9 volt
alkaline-if-I-have-them batteries for back up if there is an AC power
failure, and they last less than a day.
OTOH, the tiny little battery in a watch will last 5 years.
I don't think the clock radio displays anything at all when it is in
backup mod.
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