Yes, the battery works fine for a few months, but then failed completely. Now it appears to be charging but won't hold any charge at all. It is very pricey for a copy too.
Bear in mind if you are buying an Evoke Flow it is pretty flakey. It takes over a minute just to turn on, is very fussy about whether it will or won't hook up to the internet or a computer - some days will, some days won't, and has a number of other shortcomings, e.g. it won't work as a wake-up alarm unless plugged into the mains. Too much tech, not enough refinement!