Batteries

e=m*c*c, so in theory, yes. I doubt if you can measure it.

not measurably. but they must, E=mc^2.

non-sealed lead-acid batteries actually get lighter :)

Any idea what the theoretical math formula looks like! (or is that it?!).

That's it. The Gospel According to St. Albert (Einstein), which says that energy is equivalent to mass. If you add energy to anything, it therefore is effectively gaining mass - but if you work that formula out with some actual numbers (and that "c * c" bit is a Really Big Number), it winds up taking a LOT of energy to equal just a little teeny- tiny mass. Hence, you are not very likely to be able to measure the change - we're probably talking (off the top of my head here) micrograms, if that.

Bob M.

Would that be due to gassing?

yeah.

Bye. Jasen

When charging a battery, you are only transferring electrons from one side the other. Even if you were able to add electrons to the battery, considering their extremely small mass, I would doubt you could even weight a number of megawatts.