Gomadic Portable External Battery Charging Kit suitable for the Canon PowerShot A550 Includes Wall; Car and USB Charge Options
Canon Knowledge Base - Replacing the Date Battery for the PowerShot A550, A560 and A570 IS.
Amazon.com : Canon Powershot A560 Digital Camera Battery Charger Replacement of 4 AA NiMH 2800mAh Rechargeable Batteries, with Charger : Camera And Camcorder Battery Chargers : Electronics