Sony Np-fw50 kit is value the money. I purchased 4 of them with 4-port hub charger and now I'm enjoying 4-at-once charging! Recommend to every other camera users.
This kit fits with NP-FW50 battery from Sony. It is really portable cuz it can be stacked with the magnetic.
Compact and small! The kit can charge Sony A7 camera battery and Sony a6000 camera battery together. You should buy it with the hub charger with 2port or 4port.