I've got the exact same one (T18) in front of me now as my 'Taking Out with me' Vape...
If your looking for a better battery life, go with the T22 (The T18s big brother) Still very similar to a cigarette in terms of vaping. No huge clouds, but easy to think its a normal smoke.
Additional issue - DON'T get the T18e Or the T22e as the 'e' means its got a smaller tank so you have to fill it more often, but also watch out when getting new coils - us be aware that coils for the normal, and the coils for the 'e' series are different
Enjoy