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  1.    #1  
    How long will a charged spare battery hold its charge? Was thinking of keeping a charged spare battery in my luggage for when I travel. Will the charge run out if it is not used?
  2. #2  
    The longest my spare battery has sat is about four days and it was fully charged when I put it in. The other option would be to swap out the two batteries every couple of days just to make sure the spare is always topped off. This is what I do.

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