Jim,
I have read and enjoyed both your books. I have told all my like minded friends about them.
Regarding LED flashlight batteries: I have a flashlight from Sportsman’s Guide that uses two of the CR123 batteries, it will also use the #18650 lithium ion battery. One of these takes the place of two of the CR123 batteries, and last much longer, and is rechargeable. The charger can use either 120 VAC or 12 VDC input voltages. I have a system set up that uses the Harbor Freight 45 watt solar panels. I bought mine on sale for $149 and use them to charge a NAPA-branded Booster PAC [“aka “jump pack”]. I can then use the booster pack to power my Accu-Manager battery charger
Keep your powder dry, – C.K.M.
JWR Replies: Keep in mind that there are now rechargeable Li-Ion CR-123 batteries available. Previously, I was only able to find inefficient 120 VAC-sourced chargers available for these batteries, but now DC-to-DC chargers are available.