I have the same problem with my 900mah ego-t batteries. I would like to have more durable batteries
that are the same diameter as the ones I have, that are 14mm.
Would I gain anything by going to VV batteries? I'm using a mini protank 2 glassomizer.
Well the "spinner" types will give you a longer battery run but they're typically too long for me.
Seriously consider the iTaste VV V3. Yes, it's an 800mah battery but has a pass-through so you can vape when you drive or when near a USB port. Plus you get a digital readout, with power remaining, wattage settings and it will check ohms. A nice little compact device. Very "pocketable" without the atty.
The "chip" and display for the VV3 is the same as that in the MVP2. So if you get both (like I have), operation is pretty seamless when you go from one to the other.
Ebay has 'em for about $28. Free shipping and typically no sales tax of course.