When you look to buy a vape battery charger, you shouldn't just buy one that your batteries fit into. There are several factors to consider before you jump to make the purchase, which will ensure that your batteries are safely charged. You should consider:

Safety features. Your vape battery charger needs to be able to stop the flow of power when charging is complete.
Charging input rates. You don't want it to take hours to charge your batteries, and a high input rate will help with that. If the input rate is too high, then it could damage the life of your batteries.
Display accuracy. Vape battery chargers don't accurately show when a battery is done charging. Check reviews on a variety of platforms to make sure that your vape battery of choice shows correct information.