Regarding batteries, BUY GOOD BATTERIES!
Vaping has seen good batteries become available more widely than just a few years ago. Do not buy batteries from Amazon or eBay! Both are overrun with fakes that can cause fires.
Vapecell is a good brand that can be found at larger Vape Shops. Samsung and Molicel are top brands that are widely available too! For people not super familiar with modern Lithium batteries, staying with these brands will keep your wallet safe and avoid hazardous batteries.
I will throw out a mention of SureFire and NiteCore brand batteries with built-in USB charging on the battery as a good option for some but, they are relatively expensive and have lower storage capacities. They are protected batteries though so, better for children or people who are careless around high-power batteries like these modern 18650/21700/26650 options.
Storage capacity is mah which is the size of the "gas tank". Most modern batteries will do 15A sustained so unless you are running a specialized flashlight requiring more power, you will be good. I have some batteries that will do 40A each and battery carriers that will do 4 in parallel and exceed 40A easily which is an unreasonable power level for most general-use flashlights, not to mention needing welding gloves for usage!
Vaping has seen good batteries become available more widely than just a few years ago. Do not buy batteries from Amazon or eBay! Both are overrun with fakes that can cause fires.
Vapecell is a good brand that can be found at larger Vape Shops. Samsung and Molicel are top brands that are widely available too! For people not super familiar with modern Lithium batteries, staying with these brands will keep your wallet safe and avoid hazardous batteries.
I will throw out a mention of SureFire and NiteCore brand batteries with built-in USB charging on the battery as a good option for some but, they are relatively expensive and have lower storage capacities. They are protected batteries though so, better for children or people who are careless around high-power batteries like these modern 18650/21700/26650 options.
Storage capacity is mah which is the size of the "gas tank". Most modern batteries will do 15A sustained so unless you are running a specialized flashlight requiring more power, you will be good. I have some batteries that will do 40A each and battery carriers that will do 4 in parallel and exceed 40A easily which is an unreasonable power level for most general-use flashlights, not to mention needing welding gloves for usage!