2500Lu Super Mini CREE Q5, 18650 Powered LED Flashlight Supplied with a 18650 Li-Ion battery AND A USB Charger & Lead Brand: SkyWolfEye TLY-006 Function: Shock Resistant Lumen: 2500 Switch Mode: Sos Battery Type: 18650 INCLUDED Lighting Distance: < 50m Light Source: LED Bulbs Charger: Rechargeable INCLUDED Zoomable: Adjustable Material: Aluminum Alloy Colour: Black Waterproof: Yes -Not to be immersered- Certification: CCC LED Beads: Q5 18650 Battery dimensions. What do all these numbers really mean? 18 The first two digits '18' stand for diameter in mm. In this case width is 18mm, 65 The third, and fourth digit stand for length in mm. That would be 65mm, 0? For those who want to know why zero is there, this is how battery manufacturers calculate batt. length: 650 divided by 10 is 65mm. Ta Da! 18650 battery size dimensions = 18mm by 65mm - 18650 Metric system(mm) is used almost always when we see li-ion battery with numbers like: 18650, 18500, 16340, 16650, 14500 & 26650. These are the most common li-ion sizes. So, next time when you see 18650 battery you'll know THE meaning of all these numbers.That said, battery dimensions in a real world can, and will vary.Important: These measurements are for bare Li-ion cells only (also called "unprotected" or "flat top"). If you see "PROTECTED" printed next to 18650, 16340, 14500, 26650 ... that means that external protection circuit board is welded to the bottom of the bare cell, and flat wire is added to the side of the cell. Because of added external protection protected Li-ion batteries are 2.5mm to 3mm longer, and can be 0.5mm wider than bare Li-ion cells.

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