10/10 hands down my favorite battery !
Shout out to WulfMods
I now own a few of these. While not disguised, they are highly palmable/discrete. I use them to hold oversized cartridges, or unique ones that I don't want to keep in my main daily driver units. Not a lot of small batteries can both fit and efficiently heat a 3g cart, but the open-top design fits wider units easily. And unlike some styles of vape, internal mess/clogging is mostly avoided. The only thing holding these back from a full 5 stars is the battery capacity - My main batteries (the concealed/nic-vape type) have more than double the juice in a similar footprint. There's plenty here to power a few sessions, but the recharge frequency is slightly irritating. Finally, I enjoy the wide range of colors, which I use to help code cart strains (I keep a sativa on the orange one, etc.).
Overall, a dependable, versatile tool that offers good value.