Rich;
There are the Tadiran rechargable lithium cells too. They are AA size
with a capacity of 750 mAH and weigh .6 oz each. Two of them makes a 6v
pack that weighs 1.2 oz. They have a max rated discharge rate of 2A -
plenty for a three channel 2 meter plane or a full house HLG. As I
understand, the slow fly guys are using these to regularly get 30 minute
to 1 hour flights.
Wes-Technic has some custom made Tadiran cells 2/3 AA size. These are
430 mAH capacity and weigh .4 oz each. These would be excellent for HLG
- I intend to get some one of these days soon - like when I get around
to working on my DJ Aerotech Wizard Lite. Should be an excellent match
for that plane.
I am curious about the solid polymer Lithiums. As I understand, they
have good capacity and are very light.
Good sky;
J.P.
Rich Hollyday wrote:
[snip]
> Lil Bird is 1/2way done, and it IS easy to build, and super light, super
> strong. Shears all the way to the tips, and D tube too. It will build a bit
> faster now with the Quest dead. Ordered HS50's from local hobby shop today.
> Had my local battery plus store weld me a pair of 2/3A (K123LA) lithiums to
> make a 1.3 ounce 6v pack good for 1300mAh. Scobie turned me on to this,
> thanks. I will write my experience with it.
>
> I have found a battery holder that allows quick replacement of the "223"
> type double lithium cells, 6v battery pack. These are rated 1300mAh, and
> available for 11 bucks everywhere. This holder lets you click the battery
> cartridge in place, and replace the dead battery easily when (if?) that
> happens. No need to solder cells or clip off the connectors everytime. Look
> for this on my website in a month or two. I don't know about weight,
> material, etc yet. My wife has a Canon 35mm camera that uses this battery.
> She has replaced it 4 times in 10 years. One lasted a whole 3 month photo
> trip to Europe.
>
> A brand named "GP" makes these lithium packs considerably cheaper than the
> energizer, duracell and sanyo versions, like $7. Anyone had experience with
> his brand? You usually get what you pay for, except that the battery bunny
> gets 40 million a year, and GP has no bunny, in fact I've never heard of
> them, maybe they need a bunny.
>
> I'm still looking for lighter alternatives (smaller capacity) on the
> lithiums, but no high power cells are any smaller than the CR2, two of
> which make a 750mAh pack, 6v, still 0.9 oz.
> The smaller N sized cells that Scobie was thinking about in an ancient post
> of his are low power, max discharge is only 80 ma. But they are the perfect
> size, same as 50 mAh nicad cell.
>
> One possibility is the new solid polymer lithiums out now. They are 1mm
> thick, flat squares and can bend to fit in anywhere, can discharge up to
> 5C, charge at 1C (1 hour). They are rechargeable, but need a custom charger
> to do it. I'll chase it and see where it leads. Mark Mech brought these to
> our attention a while back.
>
> Enough,
> Rich Hollyday
--
\____________|_____________/ Ya shoulda seen the one that got away -
--O-- It was THIS big :-))
J.P. Morere
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