When charging your Bilby, the LED's will continue to accumulate and flash as the charge increases. When all 4 LED's are flashing this indicates the Bilby is fully charged. You may unplug your Bilby.
The intention is for all indicator LED's to flash for five minutes after fully charged, then all LED's switch off. We are working on adjusting the Bilby firmware in the short term, to fix this. We will let you know when this is available. In the mean time, be assured your Bilby is fully charged when all LED's are flashing.