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Battery weight?
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I.F.
electronics forum Guru


Joined: 30 Mar 2006
Posts: 407

PostPosted: Wed Jul 05, 2006 7:39 pm    Post subject: Battery weight? Reply with quote

Do batteries get heavier as they're charged?
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hhc314@yahoo.com
electronics forum addict


Joined: 11 Sep 2005
Posts: 88

PostPosted: Wed Jul 05, 2006 9:21 pm    Post subject: Re: Battery weight? Reply with quote

ian field wrote:
Quote:
Do batteries get heavier as they're charged?

Technically, yes. But it's a relativistic thing and you'll never be
able to measure the wieght (actually mass) gain.

On a practical level of measurement, you won't be able to detect any
difference in weight between a charged and uncharged battery since they
are closed systems.

Harry C.
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I.F.
electronics forum Guru


Joined: 30 Mar 2006
Posts: 407

PostPosted: Thu Jul 06, 2006 2:53 pm    Post subject: Re: Battery weight? Reply with quote

<hhc314@yahoo.com> wrote in message
news:1152134504.908189.136470@b68g2000cwa.googlegroups.com...
Quote:

ian field wrote:
Do batteries get heavier as they're charged?

Technically, yes. But it's a relativistic thing and you'll never be
able to measure the wieght (actually mass) gain.

On a practical level of measurement, you won't be able to detect any
difference in weight between a charged and uncharged battery since they
are closed systems.

Harry C.


Any idea if there's a mathematical formula to explain this? - there seems to
be for just about everything else!
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lopez
electronics forum beginner


Joined: 27 Apr 2010
Posts: 4

PostPosted: Tue Apr 27, 2010 6:58 am    Post subject: Reply with quote

I'd have to say yes, because the potential energy is higher, but the difference between full and empty is going to be so small as to be unmeasurable.If you figure out how much energy (e) is stored in the battery, you can find the mass of that energy:
m = e/(c^2)
c^2 is a huge number, so e would have to be huge too to get a number that's measurable.
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