If you want a sleeker, smaller look this is the battery for you! It is a black battery with a black button and a blue light tip! Brought to you by Smoktech! Combine this with the 510 atomizer and the 510 cartridge and you have a heck-of-a good looking E-cig! It has a 510 threading but I do not recommend using this with any of our ego sized tanks. A 510 tank works great if you like the convenience of reduced fill-ups! Available in black only. Ours are 350mAh so they are a little bit longer than some 510 batteries.