On 25 Apr, 03:41, Udo wrote:
I want to second Bill's comment.
A123 cells are also "much less" sensitive to charging error, as well
they can be discharged at a higher rate. They are 20% heavier
everything else being equal then the Polymer cells. They have no
memory and 1000 plus cycles. The last I heard the Dewalt pack of 10
cells can be had for about $100.00 but that was six month ago.
Udo

I have done the RC thing for over 45 years. I've observed that as the
use of LiPo cells have progressed the rate of failure has decreased.
Inspite of that I would also either use a metal cased cells or a pack
in a metal box if I were to use them in an aviation application.
Istalled in the PDA or Cell phone they have some puncture protection
and that seems to be one of the major hazards to their use.

On the same idea; the A123systems cells are metal cased and at $110
for six (2.3 Ah) of them is a pretty good deal as far as lithium cells
go. I'm planning on getting several "Developer Kits" to assemble
several packs for the glider. Four cells, each a little larger than a
AA Alkaline, means that I can get a pretty good serial/parallel
battery setup and fit the individual battery packs into small
spaces.

The BIG handicap is the cost; to assemble 3 packs will cost $220 plus
assembly and wiring, for a 7.2AH pack.

It would be cheaper to buy a pair of DeWalt 36V LiFePo4 power tool batteries
from eBay for around $150. Each pack contains 10 A123 Systems 3.6V 2.3AH
cells. A 4x5 pack would be a nice 14.4V, 11.5AH glider battery.

Bill D- Hide quoted text -

- Show quoted text -

http://www.lange-aviation.com/htm/en...ry_system.html

Antares flys on Lithium Ion batteries. I have no problem with my light
current draw, aluminium boxed, low current consumption LiPo pack that
is always within eyesight in the cockpit.

At worst I can stuff it out of the clear view panel!



Ian