CHARGERS
There are two types of charger available here;

The first is a standard 510 Thread USB 5V charger, operating with a 4.2V = 420mA output.
Generally speaking this is exactly what most people would have for their first charger.
Fine for use with most standard eGo/510 thread batteries.
Please check your battery specifications and recommendations.

The second is a Kangertech charger, specifically recommended
for use with all eGo/510 charging Kangertech batteries.
They operate at 4.2V = 400mA output.
The build is stronger overall and I find them much more convincing quality wise.
I actually use this charger for all of my batteries these days.
Certainly worth grabbing if you have one of the Kangertech EMOW batteries.

Again - please check your battery specifications and recommendations.