Bower Adapter Tube for Canon G15 & G16 Digital Cameras - 58mm - Extension Tubes & Lens Adapters - ShaShinKi
Canon PowerShot G16 Accessories - Canon Europe
Amazon.com: Synergy Digital Camera Battery Charger, Compatible with PowerShot G16 Digital Camera Battery Charger - for NB-10L Battery - Replacement for CB-2LC Battery Charger - (110/220v with Car & EU adapters) :