How efficient are rechargeable batteries?

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Offline thedoc

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How efficient are rechargeable batteries?
« on: 01/04/2012 09:29:02 »
Grant Keighley asked the Naked Scientists:
   Hi guys,

Love the show.

I recently bought some rechargeable batteries for my children's toys and as I was doing the initial charge I wondered about the efficiency of recharging batteries, namely, is it an efficient process re the amount of power (energy) going into the battery as compared to the amount of power that is stored and subsequently used.
Cheers from the land of Oz.
Grant Keighley
What do you think?
« Last Edit: 01/04/2012 09:29:02 by _system »