Yes, I have the exact same KeepPower battery and it won't fit in my Tain Zenith which is also a 18500 light. In fact, I have two (one version has more trits in the tail than the other), and it's too tight in both. However, the AW, Efest, and AWT batteries fit just fine. Of the four different 18500 batteries I have, the KeepPower is the only one that doesn't fit. It does fit in my other 18500 lights, which are a Mr. Bulk Dragonheart, Luter multicolor LED, and Convoy S2.
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