In general, a flashing indicator typically denotes either a problem with the battery or that the battery is too hot.
The battery is not on the recall list dell put out?
You can find out by going here: https://www.dellbatteryprogram.com/Default.aspx
If the battery is hot, remove the battery from the system for some time and try reseating it again. If another similar system is available try using your battery in that system to see if the problem occurs there as well.