So I went to charge the batteries in my Homepatrol - II last night. The LEd on the front of the unit turned red like it has done before. This morning I saw that the LED was flashing red. I have never seen this before. The manual just says " The Charging LED on the front of the unit turns red while the HomePatrol‐II is charging." Nothing about a flashing red led. I amk going to take a guess that there may be a battery problem. Is this assumption correct?