Your Sphero app-enabled robot may blink a red light sequence after being removed from the charging cradle after a full charge.
A quick red flash indicates that firmware of your Sphero app-enabled robot needs to be updated. You can learn more about firmware updates here.
A slow red flash indicates that your Sphero app-enabled robot's battery needs to be recharged. If you have charged your Sphero app-enabled robot for 3 hours and removed it from its charging base/cord and your robot has a slow red flash within the first few minutes, this indicates that the battery of your robot has reached the end of its life. You can learn more about the batteries in Sphero products here.