There is some confusion. This battery pack isn't a plastic-encased slide-on
nickle cadium version containing individual cells. This is an internal
pack. It is lithium ion. You can't solder to it. It is encased in
stainless steel. On the other side it performs better. It lasts longer.
It is "better behaved" than Ni-Cads ... as long as you don't mess with it
.... then it blows up.

Good suggestions so far:
My own: The Pentax battery charged in the widely available Pentax charger.
The tabs are copper.
Andrew: A StarTac pack in a StarTac charger.

Although $50 for the pack is the best way, I can buy eight Pentax batteries
and a charger. For the same price I could throw seven of the Pentax
batteries away and still have one battery either way.

http:\\www.w8iz.com\ham\alinco\index.html

73,
Steve, W8IZ