In prehistory, humanity's biggest fears were sabre-toothed tiger attacks. Then societies feared foreign invaders. Later, stock market crashes dominated peoples nightmares. Now, the thing that brings on panic attacks is the idea of watching a smartphone, tablet or portable video game console run out of battery life. Stay stocked at Batteries.com. They've got thousands of batteries and a handy battery finder that lets shoppers input a device and automatically find the right accessory for every camcorder, smartphone, laptop and digital camera on the market.