More than two years of vaping here, and Ive tried my share of gear. All of it 808-compatible. My search for a truly great battery (for a non-fanatic vaper) ended a year ago when I found the PigCig. Used four of the 650 model for the past year with excellent results and not a single prob. Just tried the new 900 model (completely redesigned), and its even better in key ways: improved switch, quicker charging, longer charges, and sharper looks (warmer satin finish and finer detail). The shorter cut-off time may bother some folks, but I myself had no prob adjusting since the vape's so rich. End of the road for me and certainly worth a try if you're still on the hunt.
