Diarist.com

For many years, nickel-cadmium had been the only suitable battery for portable equipment from wireless communications to mobile computing. Nickel-l-hydride and lithium-ion emerged In the early 1990s, fighting nose-to-nose to gain customer's acceptance. Today, lithium-ion is the fastest growing and most promising battery chemistry. The lithium-ion battery

Admit it. Come out of denial. You know your laptop that was supercool 2 years ago now gets 15 minutes of VGP-BPS2A battery life. It sucks and we all share the same problem eventually. Laptop batteries (and many others) will start to lose their total charging capacity after awhile. It's slow so we usually don't notice it until years later. But when it happens, you can't help but go insane.