Half a croissant, on a plate, with a sign in front of it saying '50c'
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Mobile Charger with a Battery Slot

Charge the battery even when your cell is not plugged.
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I got this idea when I was writing about "super battery charger".

Imagine the rechargeable batteries charger, now imagine it with cellphone battery(s).

wildcraft, May 10 2010

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       not that I mean to be rude(r than usual) but you mean they *don't* make standalone battery chargers for cellphone batteries ?
FlyingToaster, May 10 2010
  

       I had a standalone battery charger for cellphone batteries for my old phone I had in the mid-90's. It could even charge two batteries at once.
hippo, May 10 2010
  

       The portable chargers are better because you don't have to take the battery out to swap it, you just plug in a battery as the charger.
marklar, May 10 2010
  

       Way baked... The sync cradle for the Palm Treo 650 (and presumably later phones) has done this since 2004. One battery charges inside the cradle, a second battery charges inside the phone sitting on the cradle.
In No Particular Order, May 10 2010
  
      
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