Am I imagining?

[E equals MC2]

?

 

[Sphexi]

Electricity weighs a lot. Like, 16 ounces for every pound of amps or something like that.

 

[Jeff7]

Maybe the chemicals have just dried up.


Does anyone else see the irony here? Energy and mass in a battery, posted by E equals MC2.
:laugh:

 

[jadinolf]

As has been said, the electricity has run out so of course they are lighter.

 

[DaWhim]

placebo effect? I measured mine in gram, they weighted the same. I did felt the used ones were lighter

 

[daveymark]

the battery loses its soul when it dies. hence the drop in 21 grams

 

[smack Down]

Originally posted by: DaWhim
placebo effect? I measured mine in gram, they weighted the same. I did felt the used ones were lighter

Measure it in ounces then you will see a difference.

 

[FoBoT]

electrons are really really small

electron mass = 9.10938188 × 10-31 kilograms

 

[Evadman]

Originally posted by: FoBoT
electrons are really really small

electron mass = 9.10938188 × 10-31 kilograms

Even so, they don't just disappear, they flow though the circuit from negative to positive. Then, there are a TON of them. How many?

6,241,507,648,655,549,400 per second per amp. a 2200 MAH AA battery would move 2.2 amps for 1 hour. Or 6,241,507,648,655,549,400 * 60 * 60 * 2.2 = 49,432,740,577,351,951,248,000 electrons. That's officially a ton. If they went to oblivion, the battery would weigh 49432740577351951248000 * 0.000000000000000000000000000000910938188 less = my calculator doesn't go that small.

The real weight difference would be in the amount of energy used.
Watts = Amps * Volts
w = 2.2 * 1.2 * 1 hour
w= 2.64 watt hours = 9504 joules
e=mc^2
9504 = mass * 300,000,000 * 300,000,000
9504/90000000000000000 = mass
0.0000000000001056 kg or 0.0000001056 milligrams in weight change.

No way you could detect that by hand.

 

[nonameo]

I've noticed that good alkaline batteries weigh(much) more than cheap flea-market non-alkaline batteries.

 

[drinkmorejava]

lol, this thread make me laugh

FYI, you're not losing any electrons, they are just moving from one potential of the battery to the other. You end with the same number you started with.

 

[xcript]

Originally posted by: daveymark
the battery loses its soul when it dies. hence the drop in 21 grams

:laugh:

 

[DaWhim]

Originally posted by: daveymark
the battery loses its soul when it dies. hence the drop in 21 grams

what if that battery is rechargeable? resurrection? lol

 

[Goosemaster]

Originally posted by: drinkmorejava
lol, this thread make me laugh

FYI, you're not losing any electrons, they are just moving from one potential of the battery to the other. You end with the same number you started with.

yeah, and that build up eventually results in a useless battery since there is no more charge on the other pole to encircle the circuit....

 

[Goosemaster]

Originally posted by: xcript

Originally posted by: daveymark
the battery loses its soul when it dies. hence the drop in 21 grams

:laugh:

 

[Number1]

I have noticed that when I buy good Energiser e batteries, my wallet does feel lighter!

 

[RichUK]

Originally posted by: drinkmorejava
lol, this thread make me laugh

FYI, you're not losing any electrons, they are just moving from one potential of the battery to the other. You end with the same number you started with.

NO, NO, NO, YOU'RE WRONG.

Contrary to popular belief batteries are not connected in an electrical circuit. When the electrons come out of the battery they fall on the floor and are lost forever.

 

[glenn1]

FYI, you're not losing any electrons, they are just moving from one potential of the battery to the other. You end with the same number you started with.

So it's sorta like a treadmill for electrons, no wonder they're losing weight. "Hey baby, you been working out?"

 

[Mark R]

Someone once came up with an equation that links mass and energy.

It therefore follows that a discharged battery (which has lost its energy) will therefore lose some mass.

Running some numbers through Windows calc - I reckon that a typical AA battery will weigh approximately 0.1 ng less when discharged.

 

[IAteYourMother]

the heat loss = energy/mass. So basically, no real change.

 

[soydios]

Originally posted by: nonameo
I've noticed that good alkaline batteries weigh(much) more than cheap flea-market non-alkaline batteries.

This is probably true, as they hold more alkaline paste in them.

 

[glenn1]

Electricity weighs a lot. Like, 16 ounces for every pound of amps or something like that.

But where can you buy it in bulk, like 10 pounds of so the size of an alternator?

 

[Evadman]

Originally posted by: Mark R
Someone once came up with an equation that links mass and energy.

maybe it was the OP. Based on his name anyway.

Originally posted by: Mark R
Running some numbers through Windows calc - I reckon that a typical AA battery will weigh approximately 0.1 ng less when discharged.

It's nice when someone else does the math for ya huh.

 

[jadinolf]

Originally posted by: DaWhim

Originally posted by: daveymark
the battery loses its soul when it dies. hence the drop in 21 grams

what if that battery is rechargeable? resurrection? lol

Yes, after charging it weighs more. Everyone knows that.

 

[jadinolf]

Originally posted by: glenn1

Electricity weighs a lot. Like, 16 ounces for every pound of amps or something like that.

But where can you buy it in bulk, like 10 pounds of so the size of an alternator?

Ask here:

http://forums.anandtech.com/messageview.aspx?catid=38&threadid=1803934