At a US-bike tour last year I used the EasyAcc on my touring bike as a buffer battery between hub dynamo and navigation device. Worked very well to supply the Navi with current at constant voltage. In addition, the EasyAcc was loaded in the evening, the capacity was enough to use it to charge my camera battery or the phone. With 120g the battery is also not too difficult.
A key feature of this battery is that it continues to supply power to connected equipment while charging. This is not self-evident: the way the mini-USB socket fell out over which the battery has power. So I had to go get replacements (difficult if you are traveling in the province), but this replacement battery provided unfortunately when loading no electricity, was therefore not for the supply of the navigation device used.
I have unhesitatingly getting later by the manufacturer replace the defective EasyAcc. This charger works to date problems
