Question : Ways to prolong lifespan of netbook laptop & PDA phone battery

I'm enquiring abt prolonging battery lifespan, not minimizing power usage

I have a multitouch netbook that uses polymer battery, a Motorola DEXT PDA
that comes with Lithium battery (I think) & Samsung i780 PDA (comes with
2 Lithium batteries)

Q1:
Is it true that if I uses till the batteries are fully drained, then only charge it,
this will prolong the lifespan of the batteries?

Q2:
If I left the battery in the netbook (or a laptop) while the power is plugged
in, this will shorten the lifespan of the battery - is this true?
One advice I got was to remove the batteries when AC power is plugged
in (for netbook & Laptop) unless I want to charge a drained battery or when
I'm on the move & there's no AC power, then only plug in the battery : this
will prolong battery lifespan

Q3:
Are there any software or tools that I can use to enhance battery lifetime?

I'm asking all these questions as some of the PDA & polymer batteries are rather
costly & getting a compatible batteries for PDA have been known to cause
high temperature of my HTC & Nokia PDAs mobile phones & damaged them

Answer : Ways to prolong lifespan of netbook laptop & PDA phone battery

A. 1 : as long as i know using notepad/PDA till battery fully drain, and then charging will not affect the life span

A:2 : laptops/notebooks have inverter to reclaim power from battery when AC fails, also over charge protection circuits.
it is advisable to do not always put laptops on AC adapters, let them have some test of battery juice for some amount.

A 3: No software in market that enhance battery lifetime, also battery lifespan depends on temperature , environment changes ,etc.

the software avail in market that claim to enhance battery lifetime, it actually disable rarely usable hardware, so u can use system on battery last longer.

++ : do not remain insert battery in laptop/pda if you plan to not use for log time (more than 20 days)