Battery Symbol Flashing: Medela Freestyle

cltk12

This morning my battery started flashing on my freestyle.  I use it all week long and it only goes down 1 power bar of the 3 bars and I plug it in every Sunday night. The symbol started flashing while I was using it, so I plugged it in after using it and then it started flashing 'BATT'.  My husband took the battery out and put it back in to try to reset it.  I'm pumping now, the pump is working, but the symbol is still flashing.

Has anyone had this?  I hope it's not dying!