Arlo Pro cam works when plugged in - but after unplugging, it does not function

[Auchen]

System was working flawlessly but then the cameras were not in use for several months - so I went to charge them up and noted that they reconnected successfully to the base station, and that they functioned normally when plugged in (via USB). I attempted to charge each of them for a couple hours, but when as soon as I unplug from the USB, they do not function - and the Arlo web App says that "It's time to charge your batteries" . Do I need new rechargeable batteries? - ( Do I need new cameras? )

[jguerdat]

There's an FAQ here on recharging dead batteries.