ORIGINAL: Electrolight
Charlie P thats BS.
The only difference between a 4.8 volt and 6 volt batterie is the six volt gives you more torque. (mostly for bigger servos)
As far as how much time you have till the batterie is dead, that depends on the maH rating. ( The higher the maH rating the longer the batterie lasts)
An the difference between a NiCd and a NiMh Is that the NiMh usually has, on average, a higher maH rating. And they are much more forgiveing when charging partially charged. And NiMh are slightly heavier.
These are the main differences. Good luck
Electrolight
Aside from being disrespectful and beligerant you are simply wrong. When comparing battery characteristics is is the norm to compare packs of similar mah ratings. Charlies post was dead on and yours, as usual, flawed. As for comparing weights that also depends on a number of other factors.