I have some 9V batteries I didn't throw after they failed to power my
multimeter, smoke detector and a few other things. When my regular AA
batteries stop working in the camera, I put them in my flashlight till
the light is too dim. So I thought I could use those 9V batteries the
same way. But where can I buy a flashlight taking those square shape
Never seen one myself, though such things probably exist. Old-school
(i.e., incandescent) flashlights tend to use 2-3 cells, and almost all
the newfangled LED lights I've seen use 3 cells (4.5 volts) for some reason.
Hey, maybe you could put 2 LED lights in series and use a 9-volt battery
for them ...
I am a Canadian who was born and raised in The Netherlands. I live on
Planet Earth on a spot of land called Canada. We have noisy neighbours.
I think you might get better results if you used a #70 drill but drilled
through the post at a 50 degree angle. This way the venturi effect
multiplies the force of the centrifugal accelerator, the #60 drill is for
the linier accelerator.
About the time I had mastered getting the toothpaste back in the tube, then
One thing I have not seen mentioned is that AA batteries do not last too
long in many cameras before they do not have enough power left to work the
camera. A camera needs a short, high power burst to actually take the pix.
The batteries will power other devices long after they will not power a
Most devices using a 9 volt battery will drain them at a low, slow discharge
and when they are 'dead' there is almost no power left in them.
Many digital cameras have an LCD screen on the back. If your camera
also has a regular viewfinder, shutting off that LCD can save a lot of
battery life, too. It probably draws as much or more than the flash.
I'll second that. After 40-some years of using a real camera, I feel
lost without a viewfinder to squint through, so I always change the
default setting to keep the LCD off except when using menus or reviewing
Are you saying the 9 volt batteries that stop working on my smoke
detector or multimeter won't have enough juice either to power an LED
flashlight? I'm about to order one from Amazon as Bob suggested (in
Yes, I am. The multimeter takes very little current to operate. When the
battery will not operate it about all the power is used up. Unless you use
a multimeter a lot almost every day you probably will not be replacing too
many batteries. I have several meters at home and at work. I don't use
them that often and the batteries probably only get replaced every year or
so. By then even if they are still good enough to operate something, I thik
they are old enough to throw away before they leak out the chemicals. I
have thrown away a few flashlights because of leaking batteries that were
several years old.
If you're leaving the batteries in your smoke detectors until they
actually quit working in it, you've got bigger problems than too many
flashlights! Generally the safety folks recommend replacing your smoke
detector batteries annually, or even twice annually; at that level,
they should have lots of life left in them for LED flashlights.
(I would characterize smoke detectors as using the batteries to
maintain a static bias charge over the ionization chamber, with very
little current draw, except when the unit is actually alarming. )
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