This is the first time I've bought a battery charger but after ending up with a small collection of Vape batteries, this was an obvious purchase.
Put in 3 existing 18650s, 2 of which I hadn't used for at least a year and all fully charged in a couple of hours.
LED lights showing how charged they are, and also that the charger can accommodate various rechargeable batteries means my Xbox days of buying new batteries is now over.
The fact I no longer have to charge my vape via USB saves me that extra thing to remember, and great having spare batteries for when heading out for a long weekend.
Great purchase and wish I'd done it sooner :)