Blackstar Airwire i58

Will ETA if I run into any nuances with these.
ETA: What you plug these into matters. My power-strip's USB charging port does a very poor job. However, plugging these into the USB charging port on either of my pedal boards works very well. One month later and both sets of these are still performing like new, even after hours of daily use.
ETA2: Now own a third set. Knocked one off a low bookshelf and it hit the floor. Instant death. This is utterly unacceptable. No external damage. Simply refuses to power on ... but, it will light up when accepting a charge. A device like this will be dropped at some point by anyone/everyone. A total loss like this just doesn't cut it.