I previously used the Smokeless Image Volt (78mm) in both auto and manual. Also used the X2's in manual, in a 650 ohm and 1300 ohm size.
It didn't take me long to grow tired of needing to switch out batteries with the 78mm Volts, being that they only last 3-4 hours between charges. If you are not diligent about charging them right away after they are drained, before you know it you are down to zero useful batteries and have nothing to vape on. Don't give yourself any more reason to buy another pack of cigs.
If size isn't going to be the end of the world, go straight to the X2 batteries. The smallest size gives you over 6 hours between charges, the next size 9 hours, and the longest gives you 13 hours. These perform better than the smaller batteries, too, if function is considered over form. During the first few days, I liked the automatic, but I soon preferred the manual buttons and continued to order new batteries in the manual button format.
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The above pic shows size comparisons of a cigarette, the two Volt mini's, and the three X2 sizes. The second pic shows the size difference between the 650 (6.5 hrs), 900 (9 hrs), and 1300 (13 hrs) X2 batteries. Two X2 batteries loaded with ce3's. One X2 with a clearomizer on top.