Here's my video review of the Janty Stick after having owned and used it almost exclusively for 90 days. How well it's holding up, what I've learned about it, some rants, some raves, and some tips for how to get the most out of it.
This should be helpful to folks who are considering buying one and those who already own one.
It's from China lol. Its crap only because it probably will only last about a couple months or so. It works like an automatic battery does. (or is it manual that you have?) Most are automatic and if liquid gets into the passthrough it will die the same way the auto bats do.
They also tend to have a 3 seconds cut off. Though I have not tried the 510 passthrough so please correct me if I'm wrong.