Let's take a look: Canon PowerShot G16 iFixit disassembly guide: Digital Photography Review
Pickle Power Nb-10l 10l Camera Battery + Led Usb Charger For Canon Sx40 Hs Sx40hs Sx50 Hs Sx50hs G1 X G1x G15 G16 Sx60 Hs G3x - Digital Batteries - AliExpress
Canon G16 Review
Canon PowerShot G16 Charger with Car Plug & EU Adapter - Replacement for Canon NB-10L Digital Camera Chargers (100-240V) - Walmart.com
Green Cell Battery for Canon PowerShot G15, G16 etc. 800mAh, 7.4V | Spares.se
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)