I have brand name Joyetech Ego-C Twists and haven't noticed any decline in battery life over 7 months. That being said, for the last 2 months, I have been using my pair of iTaste VV3's almost exclusively.
1. It's much easier to change the voltage and see what you've actually changed it to than the Twists.
2. The VV3 has variable wattage capability so it doesn't matter which ohm coil I have in my tank if I have it set at a specific wattage--it just delivers.
3. The pass through capability on the VV 3 is one of the major reasons I bought them and I use it often.
4. The iTaste VV3 uses a normal micro usb charger--no more having to figure out if I have grabbed the ego charger or the KR808 charger.
5. They are square so they don't roll away when you lay them down.
6. The ohms reader. I was going to have to buy one to rebuild my EVOD & Protank coils.
7. The puff counter. I don't really care about this feature but some people do.
8. They are very pocket & purse friendly. Not as spindly as an ego-c so less likely to snap. Their big brother, the MVP has all the same features but not as pocket friendly. However it can double as a spare battery pack to charge your cell phone or VV3.
Have you tried to clean &/or dry burn your tank? The coil (heating element) eventually gets clogged up with baked on crud taking longer & longer to heat up. Your's appears to be a disposable type so when it reaches the point that soaking & dry burning don't help--into the trash it goes.
If you like that style of tank/clearomizer, you might check out iClear 16, 16s, or 16b. The difference in the three is the original is more like what you have--long wicks, the 16s has tiny little short wicks hidden inside a central tube and the new 16b is a bottom coil like an EVOD or Protank but shaped like what you're familiar with and all 3 versions have replaceable coils.
My favorite tanks are my EVODs but I also use a Protank and Mini Protanks for liquids that don't get along with polycarbonate tanks--cinnamon & citrus in my case but there are other flavors that react with the plastic, too. I started vaping with 1 iClear 16 and 1 EVOD. My iClear died a horrible death due to my putting a cinnamon liquid in it, soaking it in vodka and lastly--boiling it to try & revive it. I eventually bought another one to replace it but I don't like the flavor & heat of the vapor it produces compared to my EVODs & Protanks.