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sunhux

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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
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XT
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SamMacPC

Lithium-ion batteries are the most resilient to "memory" of bad charging states, esp. if you discharge them completely from time to time. while it is true that leaving the laptop battery out will prevent it from discharging, I agree it's a bad idea.

Which PDA are you using? do you use a lot of background applications that cause the battery to drain?

Just curious.