My batteries(everactive) still going 2 1/2 years later??

[Aries]

Hi
I bought a radio(memorex) at walmart for under 20.00 cnd dollars in the spring of 2003 and It came with the batteries(everactive) in it.
The batteries are still going,we use the radio a lot

exp. In the back yard in the summer plus we left it outside overnight quite a few times and in the morning it was still on and or it had rained overnight and the radio and batteries are still working.

In the house my boyfriend listens to the radio a lot and he has a bad habit of only turning off the volume instead of turning it off.I lost count of how many times it was left on overnight.

So after almost 3 years how come the same two C bateries are still working??
How is that possible.How can two C batteries last so long with so much use?

Memorex Model :MR45
Power supply/ Alimentation
AC/CA 120V 60Hz 3W
Frequency Range/
AM : 530 - 1710 KHz
FM : 88 - 108
Made in china

Ser: 050821104091

Date code 02-11-M

[deleted-71254]

Aries,

Batteries often have a power capacity rating that is either printed on the battery, or was printed on the packaging it came in. You may wish to examine the battery to find this rating. It will be in the form of a number and the units of "milli-amp-hours", "mAh" .

Next, you may test the amount of power your radio requires at a given, typical volume, using a multimeter to measure the amount of current that it draws at the battery voltage. A little math will tell you how many hours that battery should last in that radio.

If you get these pieces of information, I will help with the math, if you like.

Good Luck

[Aries]

Thank you for your reply I looked all its says on the batteries by the way there is four of them not two its the first time I removed them.

D size/format 1.5v stamped on it is 0212
Distributed by Walmart
1940 Argentina Rd..Misissauga.on L5n 1P9
made in usa.


I replaced the batterys and the radio still works. Do you know who I can get in contact about this I called walmark yesterday and they switched me to one of their product personel who left me on hold a few times than told me basicly nothing.
So I called the cbc yesterday when and if they do a program on this subject they might get hold of me.

I searched the net on and off after the first year but I cant find anything about batteries lasting this long dont get me wrong its a good thing.
But I have a 6 year old and we go true batteries a lot in toys flashlights ect.Meanwhile this radio is still going on the same 4 batteries since the spring of 2003 .
We use it in the kitchen almost daily and outside in the summer .with so much use how is that possible

Aries

[Aries]

Hi
candice the bateries were in the radio when I bought it so there was no batery packaging.

[Jim Lewandowski]

Hi there,
this site has some basics about how batteries work. You should include some battery theory in your presentation. Most battery experiments seem to turn into product comparisons and may not address the actual science in the experiment, try to be aware of this.

http://hyperphysics.phy-astr.gsu.edu/hb ... ry.html#c1

Are you sure you haven't been using the AC adapter during these 2 years? As previously stated, most rechargable batteries have a power rating, but I have not seen this on many smaller electronic style batteries. An example would be a AA rechargable cell has a rating of 2100mAh (mili-Amp hours). Check out these tables...

http://www.allaboutbatteries.com/Energy-tables.html

Here is a nice source discussing performance of rechargers for batteries, its a bit off topic but is a nice presentation;
http://www.crypto.com/chargers/
Battery comparison
http://www.imaging-resource.com/ACCS/BATTS/BATTS.HTM


Jim

[Aries]

Thank you for your reply.

They look like regular walmart dispsables and they were in the radio when i Bought it.
thats why Im trying to find out how come they lasted so long.
I never took them out till today to type out the info I wrote above thats on the batterys.
Plus The radio has never been pluged in.

[deleted-71360]

Wow! Impressive.

There is a log of energy in most batteries and a radio does not require very much. Also, batteries last a lot longer if the same energy is consumed at a slower rate. One amp for one hour is far more damaging to a batter thay 1/10 of an amp for ten hours, even though it is the same energy consumption.

Good as it is, the batteries are probably not doing very well and the radio may sound a lot better with fresh batteries. See if you can find a volt meter and compare the current voltage of the old batteries to new ones.

Robert Reavis