Batteries and How They Work
Battery amp-hour, watt-hour and C rating tutorial
BATTERY CAPACITY AND EFFICIENCY
How To Test Standard AA, AAA, D, C, and 9V Batteries with a Multimeter
9V Alkaline Battery Construction
How to choose a battery: A battery chemistry tutorial
Power Consumption / Battery Capacity
How a lead-acid battery works
Volt LED Torch!
9V Battery Explosion