Re: [KX1] A LiFePO4 internal battery option

Posted by Chip Stratton on Mar 28, 2011; 12:39pm
URL: http://elecraft.85.s1.nabble.com/KX1-A-LiFePO4-internal-battery-option-tp6213539p6214746.html

I've been using the Powergenix NiZn cells too, and they do give a usefully
higher pack voltage than even the Energizer Lithium AA cells. They are not
as easy to manage as Nimh  cells, however. You have to use the supplied
charger with them, which seems not to initiate recharging unless the cell is
significantly drained. This makes it hard to keep them topped up. It also
seems to be hard to discover the state of a given cell since the open
circuit voltage does not fall much when nearing depletion. Their total
capacity under load appears to be quite a bit less than their ratings.
Basically there isn't enough information about their characteristics or
charging requirements to manage them optimally. Maybe that will change with
time, but they don't seem to be catching on, since I've found them at
"Tuesday Morning" stores, which seems to be where many failing products go
to die.

Chip
AE5KA

On Mon, Mar 28, 2011 at 12:30 AM, Leigh L. Klotz Jr WA5ZNU <[hidden email]
> wrote:

> Those are 6.6v, so I guess you use a pair?
>
> I've been using LiFePO4 in a lot of things, but haven't seen these that fit
> in the KX1.  At 700mAH they're a bit small, but the constant operating
> voltage is nice.
>
> You might take a look at these, which are available at Fry's and Amazon:
> http://www.powergenix.com/?q=products/nizn-quick-charger
>
> At 1.8v charged you get almost 11v out of 6 of them in the existing AA
> slots.  Of course, you have to remove them to charge. The self discharge
> isn't as good as LiFePO4 but it's not bad either.
>
> Leigh/WA5ZNU
>
>
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