On May 30, 2011, at 11:02 PM, Peter Loron wrote:

> I see that those have very high discharge/charge ratings (20C, 40C, =20
> etc). Does that typically come at the expense of capacity?

I don't know.  Essentially, these sorts of "bare cells" are only sold =20
to the RC Flight  community, where the max current is the most =20
important rating.  I haven't seen a side-by-side comparison where you =20
take the 10g cell at different max discharge capabilities and compare =20
capacities.  There's some sort of "safety conspiracy" that results in =20
it being difficult to find cells/packs without internal electronics =20
(or full data on such.) "Lithium ION technology is just too dangerous =20
and complicated for consumers unless you add $50 worth of =20
electronics."  ("Oh wait - there are people who will buy bare cells, =20
be happy if they get 20 charge cycles, and blame themselves for =20
battery failures up to and including house fires?  I guess we could =20
sell to them." (Cha Ching.  Capitalism!)

The other interesting idea is to peruse cellphone and camera =20
"replacement battery" dealers for a suitably sized cell.   Though I've =20
been pretty disappointed with the lifetime of some of the off-brand =20
camera batteries.

BillW

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.