On Mon, 17 Jan 2011 13:55:42 -0800, tstock wrote:

I've heard of a few people using a 4AA battery box with a USB charging
plug on it to run these things for many hours. Have you tried this?

That will probably be the easiest solution for a rental glider in which
I will be flying all day. Just replace the AA's before the flight.

Its also worth looking at external USB battery packs. These are
rechargeable 5v packs for anything that can be powered or charged via a
USB connection. One of our instructors uses one to power a Binatone PNA
if he's giving xc instruction in one of the K-21s. Amazon sell a range of
these units with capacities of 3000 - 8000 mAh. Prices start at $US 40.

IIRC a Binatone PNA has an internal 800 mAh battery that should run it
for 3 hours, so a 3000 mAh external battery should extend that to over 14
hours.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |