I have never heard of Orbtronic, but it appears they just buy the better brand batteries (Panasonic, Samsung, LG, Sony) and relabel them. Protection circuits are always added by the seller. You need to be careful where you buy batteries. The bingo letters after the battery often refer to properties of the battery. The one property that is important is to know if your device requires high drain, like 20 or 30 amps. Yes, 18650s pack a lot of power!

I buy my 18650s from Mountain Electronics as this vendor does a lot of business and has a huge following on the Home | BudgetLightForum.com. Flashlight information is a site with independent testing/reviews of batteries et al. That flashlight looks pretty decent. I use the XinTD C8 V5 on my bike as I prefer single battery flashlights for their safer battery requirements. I purchased Panasonic NCR18650B Protected 3400mAh batteries, but 3500 mAh ones are available now. I also tend to purchase hiigh drain batteries of some form. A bit of googling should allow you to figure out what the various letters are.You might also do a bit of reading at Basic to Advanced Battery Information from Battery University.Oh, and I doubt you'll get more than 1.5 hours out of that flashlight even with 3500 mAh batteries. That's the max runtime I get with my light. Carrying spare batteries, though, is easy enough.