This may not be what you want Matt, but for small portable radios I use
a two-pack of heavy-duty 6V lantern batteries wired in series. These
are usually right around 5 bux at WallyWorld and last for quite a
while...several extended outings.
I don't remove the plastic wrap holding the two batteries
together...just melt the wrap around the spring terminals with the
soldering iron(so it doesn't split). Then I cut the springs down to a
couple of turns and solder the wires/jumper on using my fav connector.
For the finale...wrap the whole works up in a layer or two of...you know
it...duct tape...to protect the exposed terminals and make a very solid
package. You probably shouldn't try going thru airport security with
this if you don't have a little extra time... When the batteries drop
below usefulness I simply remove the tape/wiring harness and start over
again.
Fitzie N0MF
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