I think I am going to go with a Spinner 2 1650MAH only a 1/4 to 1/2" longer than 900MAH Twist with almost doube capacity and very affordable. May pick up a Spinner 850 for out and about. Any opinions on the Aerotank Mini? Looks sleek on these types of battteries.
The Spinner 2 1650 is 125mm. Here's one I recently got and like. I've been a Joye eGo-c upgrade user since they came out and this is the first batt that I've liked after having tried a few others. I also like the smaller design but there are two diameter sizes in the Aspire CF batts. And two types as well the G batt (non-vv) and the VV.
With the smaller diameter 14.8mm (just a tad larger than a regular eGo batt at 14mm) they have the 650, 900 and 1100mAh batts. In the larger diameter 17.4mm they have the 1000, 1300, and 1600mah batts. Here's a chart with the sizes - top chart non-vv, 2nd chart vv:
The 'size 1 and 2' are just the 510/ego connection sizes. Size 3 is the actual length of the body and combining them gets the length of the batt. As you can see the larger diameter 1000 is the same size as the regular diam. 650.
These are well built and have some of the same good features of the Joye eGo-c but without the different modes (3.7 and 3.4 constant) and some additional features I really like - one the carbon fiber finish, the spring loaded center post (no more pulling up the post of the batt and/or the clearo) and the 6 vents on the bottom. The ones I received - the 1000 17.4mm diam and the 650 14.8mm diameter had serial numbers etc. that can combat clones.
I also liked the button - it's rectangular and recessed similar to the Joye eGo and not hard to find like the one EVOD batt where the button is flush with the body and away from the connection - I understand that might not be a problem for newbies but for someone who has been vaping eGos for five years now, putting it in a different place can be ... odd...
On the 1000mAh short batt, I'm using the Vapeonly D16 clearo with air control, pyrex and a sleeve that fits nicely with the larger diameter batt - well balanced and not top heavy and combined is just a bit longer than a Joye 900 (non-vv) with a T3S. On the 650's I'm using what I use on the Joye eGos - the Kanger T3S.
Vapeonly D16:
I got mine at heaven gifts:
Aspire CF Battery, Aspire Battery E-Cigarette | Heaven Gifts
Other vendors may have them but haven't seen anyone who has the whole line....
Edit: Here's the VV version. Dial at bottom - clicks on 0.1V increments from 3.3-4.8. The numbers are recessed - can't be worn off. From left to right:
650mAh (14.8mm) 900mAh (14.8mm) 1000mAh (17.4mm) 1300 mAh (17.4mm) 1600mAh (17.4mm)