If an experienced Chucklehead could give me links to sites they would go to #1 if say their batteries and battery charger somehow disappeared in an instant, that would be awesome.
I've had my Little Chuck less than a week, so I'm not experienced.
For 6V vaping, AW makes LiFePO4 CR123 3V batts, though they're out of stock at Lighthound right now:
AW LiFePO4 3 Volt Lithium Rechargeable Battery
For 3.7V vaping:
The AW 18650 LiMn battery is here:
AW IMR18650 1600mAh LiMN rechargeable lithium battery
The AW protected 18650 batteries are sold as old version:
AW 18650 Protected 2200 mAh Rechargeable Lithium Battery
... and new version:
AW 18650 Protected 2600 mAh Rechargeable Lithium Battery - New Version
The new version has a higher mAh, but I don't know if there are any other differences between them.