Nitecore have been specialising in all things electronic since 2007. This UK based brand is located in the south of England in Somerset, and first began their foray in electronics by specialising in LED torches. Since then, they have become the go-to brand for all things battery charging.
Most Nitecore batteries have been designed specifically for vaping, so it is safe to say that they are perfect for your vape device.
If your nitechord charger reads EE, it means there is an error. This could be caused by a variety of different reasons, such as using a poor quaity USB adapter or attemping to charge batteries that are not compatible with Nitecore chargers.