On 10/1/2014 2:04 PM, trader_4 wrote:
On Wednesday, October 1, 2014 1:56:26 PM UTC-4, dpb wrote:
On 10/01/2014 12:28 PM, trader_4 wrote:

...



The point is there is no good reason to be drawing down the battery at

all. And why not put in rechargeables? Duh! That's what they do in

those other examples.



The answer as outlined above is more than likely "initial cost".



Yes, that explains why they didn't use rechargeables. It doesn't
explain why they didn't use a 10 cent diode so that the alkaline
battery is just there as standby and would last for years.




Again, if these bug you so much for that reason, the obvious alternative

is to do some research and replace them with ones which do have an

extended battery life and/or rechargeables.



I agree, that's a possible solution. The comment was directed at why
they didn't put in a 10c diode so I would not have to do that.




Different device/design but the outdoor unit on the local weather

station has started indicating "low battery" at night...it's got a solar

charger and I replaced the initial battery just a month ago but it

showed the missive the other night again already. I suppose the solar

cell is now starting to fail/losing its "oomph" after 2-3 yr in the SW

KS sun...



--

Does it have AC too?
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From: "Pico Rico"
Newsgroups: alt.home.repair
Subject: Ionization Smoke Detector In Toddler's Room: How Safe ?
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"trader_4" wrote in message
...
On Wednesday, October 1, 2014 11:58:24 AM UTC-4, Pico Rico wrote:
"trader_4" wrote in message

...

On Wednesday, October 1, 2014 11:12:28 AM UTC-4, Pico Rico wrote:

"trader_4" wrote in message



...



On Wednesday, October 1, 2014 9:33:57 AM UTC-4, dpb wrote:



On 10/01/2014 7:47 AM, trader_4 wrote:







...















... since these are both AC and battery powered, why does the

battery







go out in a year, just as fast or faster than battery only
powered



ones?







...















'Cuz they're a poorly designed (read "cheap to build") and don't







actually cut the battery (completely) out when A/C is on nor use







rechargeable batteries would be the likely cause...















I've not looked, but I'd think such a unit would be readily
available







altho undoubtedly at a somewhat higher price point. There are just

the







minimal one each floor of the old battery-powered type here as

nothing's







been modified since all the recent Code changes. So, that's just

three







and the once't a year deal isn't so bad as there are no cathedral







ceilings, etc., ...















--







A diode that costs maybe 10 cents has a big impact on price?







think of the voltage drop, too.



I don't see .6V diode drop from a 9V battery being a design challenge.

The electronics is going to work on 5V or 3V anyway.



but the battery will "die" sooner.

How so? The battery is rated at X amphours. Whether it delivers it
through
a diode or not is mostly insignificant. Only a very small amount of power
is
lost in the diode.

The voltage without a diode can drop ..65v further and still power the unit.


Please trim text. 328 lines is a bit much for your two line reply.


--
..
Christopher A. Young
Learn about Jesus
www.lds.org
..