Zenith tank is LOW power... so any battery with a 510 connector would probably do it right?
I have a 900mAh Amnis battery would drive it well maybe around 15-18W for a good few hours - when it goes off green I plug in my powerbank for ten minutes and it's good to go... very cheap, and you can't get cheaper power than a powerbank to top up a small cheap mod.
It's so tiny, you actually hold the tank and fire the mod with your middle finger - 85% stealth rating.
It's also about 2/3 the price of your Zenith tank - you could buy two…
