HI all,
Regarding current draw with PDA backlights, I have done some limited
experimenting.
An IPAQ 5500, with wired gps, without using Wi-Fi and bluetooth, and starting
with a near full charge, drew 168ma at full brightness, measured at 12v input
to 5v power supply.
IPAQ HX4700, 80% charged, MAX 368ma @5v, so roughly 200ma @ 12v. (Similar
result to above).
Units such as the Altair, with its big screen and powerful backlight may draw
more than this. (Nigel A would know exact figures I suspect)
I always advise people to have their PDA as close to fully charged as possible
before placing in glider as the current draw can be up to 2 amps from 5v
(Approx 1 amp 12V)
when charging from dead flat.
I would be very cautious using Li-Po batteries for the reasons others have
posted. Ni-Mh batteries seem to offer a reasonable compromise, particularly for
those who are up
against max weight of nonlifitng parts in a particular glider (Where even a
couple of kilograms could make a difference). Even L-ion batteries used in
laptops are not unknown to have overheating/fire hazard issues(See Sony, Apple
recalls).
Regards
DaveL
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