Well the only thing I could find was it's compatible with a 1.5A "Smart Quick Charge" adapter, so I'm guessing 1A with a normal stupid adapter. 1A over 4X3,000 mAh
batteries, yeah, 10 hours is entirely possible. You can and probably should just get a quality 4 bay charger like a Nitecore or Xtar and charge with that. It will be faster. You can also keep another 1 or 2 sets of matched 4 battery sets so you can rotate though and have a set charging while you're
vaping in comfort.