If you are planning to buy 18650 flashlight there are few things that you should look for and you can find buying guides on special websites like http://tacticalflashlightexpert.com/best-18650-flashlights/. Flashlight is something that you are going to use at the time of emergency and it is better that you get a good one that is not going to trouble you without functioning properly.
Look for a Good Brand
It is better to get the 18650 flashlight that is made by a good brand. This ensures that you are getting hold of a quality product that is going to work properly for years.
Durable flashlights are the ones which are made with very strong materials like aluminum of aircraft grade or titanium. They also are sealed well so that the interior of flashlight is protected well.
Portability or Power
There are some 18650 flashlights which are really powerful but when the power is more, that increases the size of the battery thus compromising portability. You should choose between power or portability as per the application of flashlight for you.
Choosing a 18650 flashlight may need you to go through reviews of various flashlights and make a choice by picking the one with best features in most affordable cost.