[Balloon] Re: Balloon 3 Questions

On 06-08-21 23:05 +0100, Mike Morley wrote:
>
>
> For robotics within the department, ~2.5AHr batteries at a nominal 12V:
> - NiMH pack - lighter, but considerably more expensive. We're
> currently experiencing problems with our charging circuits.
> - Sealed Lead-Acid - heavier, but around 1/3 the price of the NiMH
> packs. I've got a working demo sitting on my desk, and am currently
> routing a small PCB.
>
> For the PDA being developed, we obviously had to go with Li-Ion for the
> weight saving, and - for convenience - I selected the Nokia BL-5C
> battery - 900mAHr at 3.7V.

Mike, this is intersting stuff I didn't know about - could you add
your battery/PCB info to the wiki?
http://balloonboard.org/balloonwiki/BalloonPowerOptions

> The beauty of these are we can run them in
> parallel to get almost 2Ahr, and they're easy to charge -- either in a
> Nokia desk charger or a phone like the 6230i (Which both I and Chris
> Jones have)

And I've got one too :-)

Wookey
-- 
Aleph One Ltd, Bottisham, CAMBRIDGE, CB5 9BA, UK  Tel +44 (0) 1223 811679
work: http://www.aleph1.co.uk/                 play: http://wookware.org/