How to Determine the Power Rating of Your Gadget's Batteries - The New York Times
CaravansPlus: Calculating How Big Your Battery Needs To Be
Battery Capacity - Amp-Hours, mAh, and Watt-Hours - YouTube
ECO 12 Volt 10 Watt Solar Car Battery Charger & Maintainer, Solar Panel Trickle Charger, Portable Power Backup Kit with Alligator Clip Adapter for Car, Boat, Automotive, Motorcycle, RV : Amazon.com.au: Automotive