From a website I came across just the other day
http://www.greenbatteries.com/libafa...-ion%20in%20AA
Are Lithium Ion batteries available in standard sizes like AA , C or D cell size?
No, Lithium-ion batteries are not available in standard sizes. We believe this is because it would be too easy for users to inadvertently put them in a charger not designed for Lithium-ion batteries creating a potentially dangerous situation. (If an alkaline battery is put into the wrong charger it might leak or even burst, but a lithium-ion battery put into a NiCd or NiMH charger not designed for lithium-ion, might ignite. Also, because Li-ion batteries operate at much higher voltage (typically 3.7V per cell) than the 1.2 to 1.5V of most cell batteries, designing a 1.5V lithium-ion cell would be expensive.
I was watching a show on the history
channel the other, all about batteries. I t was fascinating! A couple of students and a professor from Tulsa University, were awarded an US patent last year for a Nano-Li -ion battery. Even at the nano level a Li-ion battery produces 3vdc. The Professor said, " of course at that size, we're talking about Pico-
amps" but it's still 3
volts. Amazing.
If you get a chance to watch this show, do. It's fascinating, 'specially the part about them building these "nano-batteries".