Battery:Brand: PKCELL Voltage: 3.7V Storage Voltage: 3.7-3.9V Charging Cut-off Voltage: 4.2V Discharge Cut-off Voltage: 3.0V Capacity: 2200mAh (Not High Drain)Norminal Capacity: 2090mAh Size: 18.0*65.0mm Weight: 46g Protected: NO Battery top: Flat top Max Constant Charging Current: 2200mA(1C) Max Constant Discharging Current: 4400mA(2C) THIS IS NOT 30A HIGH DRAIN TYPE! THIS IS 2C(4A) STANDARD TYPE.PLEASE MAKE SURE YOU BUY THE RIGHT BATTERIES.Material: Lithium Li-ion ICR Recharging cycles: At least 500cycles Appliations: Flashlight,headlamp,lantern,LED light,dive light,green laser,fan,headlight,torch,laser pointer and so on.You local dealers usually charge $8 to $12+ for EACH batteryCharger:Suitable for 18650 Li-ionLED indication for Power On Charging Full chargeInput: AC 100v - 240V 5060Hz, can be used worldwide (international charger, can be used worldwide)Output: Output: DC 3.7VDimension: 10x 4 x 3.5cm (L*W*H) Weight: 72g Smart charger can charge for 18650 Li-ion batteries, 18650 3.7v Package includes: 2pcs ICR 18650 Rechargeable 3.7V Lithium Li-ion Batteries PKCELL1pc 18650 charger single slot US plugFAQ:Question 1:“What? Capacity is only 2200mAh. So low! I want 5000mAh, 6000mAh or at least 4500mAh.”----Yes. Marketing capacity is 2200mAh only, and real capacity may be only 2100mAh. Before you buy those 5000mAh high capacity 18650 flashlight batteries, please go Google “18650 fake capacity”, then you will get lots of suggestions, much more than what we are going to explain as below:“First of all, there are NO 18650 commercially available batteries (at this writing) that are more than 3400 mAh!!! When you see an mAh capacity higher than 3400, it’s a complete lie!!” Here is review from a reliable flashlight forum. He is totally right. 18650 made by Japanese may be 3400mAh MAX. While most of 18650 batteries are made in China and capacity is no more than 2600mAh. 2200mAh is the most common and the most steady. Prices of 2400mAh or 2600mAh will be higher because the defect rate in mass production is higher than 2200mAh. Professional companies usually choose 2200mAh 18650 batteries. That’s why 2200mAh is widely used in notebooks.Question 2:“I want protected 18650 batteries. This listing is unprotected. Why?”---Protected 18650 batteries are like something with insurance. Do you really need a protected one？a. When you are using 1x18650 in your flashlight, no need. Device using 1x18650 usually is quite simple and safe. No need to get it more complicated. Sometimes PCB protection may get broken.b. When you device has protection already, no need. (Most of flashlights have self-protection.)c. When you device has very tight space for battery, no need. Because height of protected batteries is about 68-70mm, while height of unprotected is only about 65mm.d. When you want to save a little money and it is safe enough to use unprotected 18560, no need.Just choose batteries depending on different devices.Please be careful while choosing a 18650 battery, FOR YOUR FAMILY AND YOURSELF since battery is a safety thing in our life.