[Elecraft] Lithium Polymer batteries

[Phil Wheeler]

Dan,

What charger do you use with these batteries?

73, Phil

Dan Barker wrote:

>Wow!
>
>I received my new batteries Wednesday and put them in my model airplane.
>With NiCd batteries (500mAh, 9.6V) the plane would run about 4 minutes (65%
>power, 2.5 minutes wide open).
>
>With the LiPo batteries (4400mAh, 7.4V), it ran over 40 minutes (I don't
>really know - we got hungry and quit with power to spare. The Turkey was
>already on the table).
>
>These things are LIGHT! Each cell (I had 4) is only 45 grams; $15 from
>BatteriesAmerica.com (usual disclaimers).
>
>I'm not a backpacker or anything, so my gel-cell is fine for the K2, but you
>"travelers" really ought to look at this new technology.
>
>Charging is really different. It's constant current until 8.4V (4.2 per
>cell) at 0.5C (about 90 minutes) and then constant voltage as the current
>falls off rapidly (for the remaining 10% capacity, another 90 minutes). Not
>exactly quick-charge, but SO WHAT?
>  
>