Good alternative to the external charger of the RX100 / M1 / ​​M2 / M3 / MK II / MK III

It annoys me in-camera battery charging and I really wanted to buy an external charger for my RX100M3. Then this kit I've noticed that is advertised as an accessory for Sony Actioncams. Because they use the same battery as the RX100 series, the kit for the RX100 owners may be useful, provided it has a USB charger. Since this is heard in the age of smartphones, eBook reader and e-cigarette almost standard equipment, this will be the case for most people.
Component of the kit is also a spare battery. The batteries can be packed in the black box, which has a micro-USB connection. With the included micro USB cable can be the box Samit battery then either connect to an existing USB charger or the mitgeliferten car adapter.