Thank you, HKJ, for your reply and for all the amazing information you have made available!
I am shopping for batteries from your list.
I think I will buy a TrustFire TR-001 Multi-Purpose Lithium Battery Charge from DX, which several reviews state will accept 12DC input, at about half the...
I bought a headlight that needs 18650's,or supposedly will also run on 6v, in case I want to convert it to run from 4 D's in belt case from an old incandescent headlight.
So, I shop for 18650's and charger. I see claimed ratings for the 18650's all the way up to 5000mAhr.
What is realistic...