About rechargable lithium batteries in general ....
Many folks do not know this and I had to find it out the hard way when I
bought some rechargable lithium batteries for my camera.
Rechargable (Lithium ion) batteries decline in quality with age. It does
not matter how much they are used. Beginning when they are manufactured
they gradually develop an increase in internal impedance until eventually
the terminal voltage under load falls to an unusable level. This may not be
serious for applications that do not pull high peak current. It is
important, though, if you are really drawing a fair ammount of current (at
the one hour rate, for instance). You can quickly 'google' quite a bit of
information on this.
Just be careful not to spend a lot of money on 'new' batteries that have
been on the store shelves for a couple of years. You may see lithiums on
sale just for that reason.
Don K7FJ
Here are some 4V AA Lithium batteries.
Although they have about half of the energy the Energizer drugstore
Lithium batteries provide, it is at a higher voltage.
Uses inside the KX1, six of these series-parallelled (not series as in the
current KX1 internal battery circuit!) would provide ~12V at about 900
mAh.
http://www.tadiranbat.com/hipower.php
