Batteries are great, but charger is very questionable. Let me explain. The charger has a integrated US-plug, and comes with adapters for e.g. EU and UK. However the adapter does not lock into place, just slides over the US plug. When you try to pull out the plug from a socket, the adapter separates from the charger exposing metal surfaces of the build-in US-plug, and if you have thin fingers, you may accidentally touch these. Now I really, really hope that the adapter is build in such a way that if it is only slightly separated from the US-plug, there is no electric connection. Unfortunately I don't think that's the case. Rather the US-plug metal is at least couple of mm, probably even centimetre or two exposed while connected to mains via the adapter. Thus I would never ever use these at home or when small kids are near by, nor never try to unplug with something that could go between the gap and electrocute yourself, like keys. I am quite sure, that the charger would not pass inspection at EU, if tested.
Does what it has to