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Amazon.com : Kastar Battery (3-Pack) and Charger Kit for Canon NB-4L, CB-2LV work with Canon PowerShot SD40, SD30, SD200, SD300, SD400, SD430, SD450, SD600, SD630, SD750, SD780 IS, SD940 IS, SD960 IS,
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Field Charge 2440 - Rugged Portable Battery Charging for Outdoor Use