This is why I like FT...even though it takes a VEEERY long time to get the items...if they are defective or whatever...there is a Fl address you send your RMA to, they will refund your shipping and send you a replacement, ebay...well that whole "buyer beware" thingy...FT may take FOREVER but they stand by their warrantyi bet all the cheap Twists from eBay have overrated capacity. I'm waiting on 2 of them...i WILL do a timed charge/discharge test and calculate the actual mah capacity. Never buy anything from Chinese sellers on eBay because if it comes to a claim, paypal will ask you to return the product to China WITH tracking.. which is cost prohibitive.
If you want longevity...I suggest a rig that you can replace the battery in
They do have these really cool Vision rigs out called the VOT which are 14500 battery replaceable rigs and are eGo sized
Not sure if they are a madvapes proprietary (not showing on the Vision website)
http://www.madvapes.com/14500-variable-volt-vot.html
14500 Variable Volt VOT | Jungle Vapor

This is a variable volt device produced by Vision. It has a rechargeable lithium ion 14500 battery included. The VOT adjusts from 3 to 6 volts with the push of a button located by the display on the bottom of the battery. The switch has a 5 click on/off feature for safety. There is an eGo connector on the top so all of your eGo clearomizers or cartomizers will work just like on an eGo battery. The LED display is easy to read and has both a voltage reading and a battery life indicator so you will know when to charge it.
The battery can be removed from the bottom of the VOT for recharging.
If you like eGo batteries this is the one to get.
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