What is the difference 18650 and these 26650 mods?

[snkrumble]

Just curious I see sigelei and now another mfg has one. I see the batteries are shorter but the battery last longer or something?

I was about to pickup a new box and then these got me curious. Just wondering what the difference is and the benefit (if any)?

 

[Rossum]

18650 = 18mm diameter, 65mm long.
26650 = 26mm diameter, 65mm long.

A 26650 will generally have more capacity and will give you more vape time between charges. However, the difference isn't as big as the difference in volume might lead you to think because the 18650 size is where battery manufacturers have done the most development and thus tend to have the most energy per unit of size.

 

[KentA]