| Ed Cregger wrote:
| > When charging the battery, all you are doing is moving the
| > battery's electrons from one side of the battery to the other side
| > of the battery.
That's not a very accurate description of the chemical reactions that
are involved in the charging of a battery :)
That's more of how a capacitor works, and even then it's a bit on the
overly simple side. (In a side note, there's been a few articles
about ultracapitors lately, like this one --
they can ever make this work, we may be able to replace our batteries
with capacitors. Alas, this is many many years away.)
| A 3-cell 1.6 amp-hour Li-Po pack weighs 120 grams
. So you see a change of 6 parts per
Larger than I would have thought. But I didn't bother to do the math,
| This is, perhaps, something that you could measure one day if
| you were feeling puckish and worked at a major metrology lab, but the
| change in mass from the connector wear would probably be far greater
| than the change in mass from the charge.
I was thinking more of any outgassing that happens during each charge
or discharge being a larger factor, but there is that too.
| So a charged battery _does_
have a different weight than a discharged
| one, but only if you're a smart ass.
Oh, the mass change has nothing to do with me being or not being a
smart ass :)
In any event, I wasn't really trying to be a smart ass -- I was just
going with what Ken started --
| >>| >>
| >>| I wonder...if my battery is a little off the CG, should I
| >>| check the CG with the battery charged or discharged?
| >>| Like if ahead of the CG, check the CG with the battery
| >>| discharged, and if behind the CG, check it with the battery charged?
... and I'm sure he knew the answer to his question already :)
And I did quantify the sort of difference that charging a battery
might make in your CoG --
| >>If you don't heed my warning, your CoG might very well end up an
| >>angstrom or so off ...
(I originally was thinking of a micron, but it seemed too large. But
if the difference really is 6 parts in a trillion, perhaps microns
would be a good deal closer.)