Am i the only one who collects every possible chemistry of battery he can get his hands on?
@PlumpCat Keep in mind the chemistries and form factors are mostly independent... You can find virtually any chemistry in any form factor.
LiFePO4 is my favorite all around... Li-ion usb chargables are super cool, and as NiMh is quite nice when you want to abuse your batteries :)
I have a huge 12V car-battery style battery which is actually Li-ion and the charging regulator is built in, so you can charge it by just attached 14V to it and walking away.. even has a little battery % indicator... being as large as it is it has insane power capacity while being fairly light.