Top product - particularly sensible handling.

The mobile battery that does what you want. Have him tested with several devices (different mobile phones, Smartphone, Bluetooth keyboard, Bluetooth headset ...), and it works beautifully. Charging also takes no longer than the respective original charger. I especially appreciate that the current consumption (ie charging) is indicated by a LED. And the battery, if the device itself is loaded, shut down automatically.

A very important feature to me is the material and neoprene case. I have one other mobile battery, which, however, is in piano black finish. May look fancy, but super-sensitive and not for the bag.
This battery here is insensitive with its rubbery surface, so you can plug it also fast times. The neoprene sleeve protects the part again and is a perfect fit. Unfortunately for the cable or adapter no place in the bag provided. So that these parts must be carried loosely. I've bought an adapter USB plug to Micro-USB connector (without cable), so that's then only a small part of what happens.

Overall, the dimensions are very compact, which also ensures that the part can be easily carried. The above mentioned battery of other manufacturers, has a bit more power, is of the formats but more like a car radio keypad and therefore not as convenient.

A real shortcoming is that for charging any USB socket is available, but a small hollow plug is used (the cable. Which is used to charge with the adapters). Since you should rely on the almost standard mini-USB jack.

In short, I can only recommend the warmest device.