Rechargeable cells - fundamentals please

In brief, what does recharging do to a cell? Does it dissapate the hydrogen
equivilent that is proeduced in lead acid cells/batteries?

Lithium rechargeable Verses NiMH rechargeable!?

I need cells that will function better at colder temps. I was told that
lithium ion was the way forward, is this so and why?

Will Li-ion cells rated at 1000mAh out perform NiMH cells at 2300mAh in any
respect, including charging time, lifecycle, dissapation speed for high
drain devices etc?

Can any charger be used to recharge any cells, that is both NiMH and Cads (i
understand the technology for Li-ion is different). To clarify, i have a
uniross charger, the universal 120 (very slow and crappy i suspect). on the
back is listed certain sizes and capacities 9to fall inline with the uniross
range i have no doubt). Can i charge a cell whose capacity falls between,
below, above the range of and specific capacities mentioned on the back and
how do work out how long for?

thanks


.

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