Hearts you can get 18650 batteries that are rated at 2200 mah, if you buy an apollo mini v tube sleeve for $8.95. It extends the mini so you can use the bigger batteries that last for days on a charge, vs the 18350 which apollo rates at 700 mah and only last maybe 8 hrs on a charge but if you prefer the mini sz then i'd go with the 18350 and if their 850mah and a better deal, that would be good. I got the extention and love the big batts that last and I can still take off the sleeve and have the mini, if I want. Hope you're doing good and all. Lots of love, peace and good health, your way {{{{HUGS}}}}