Canon Knowledge Base - Replacing the Date Battery for the PowerShot A550, A560 and A570 IS.
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Amazon.com: Synergy Digital Camera Batteries and Charger, Compatible with Canon Powershot A560 Digital Camera Charger Replacement of 4 AA NiMH 2800mAh Rechargeable Batteries, with Charger : Electronics
Gomadic Portable External Battery Charging Kit suitable for the Canon PowerShot A510 Includes Wall; Car and USB Charge Options
Canon PowerShot A550 Manual for Canon's Petite Photography Device | Powershot, Old cameras, Simple camera
Canon Knowledge Base - Procedure for using the optional rechargeable battery kit PowerShot A460, A550, A560, and A570IS.