Low battery warning

I need to speak to a tech about one of my door sensors.  A few days ago I had a post from a comcast employee who I did PM but he didn't follow up with me. The issue is a door sensor that was giving us a low battery warning. Another tech ordered a sensor sent to us which we received, but unfortunately my husband was hurt before we got the sensor. My husband was at least able to reach the old sensor and remove the battery then insert it again so the low battery warning stopped. However, when I check the door sensor battery health from the touchscreen the battery says LOW. If this entire sensor still needs changed, I need a tech to come out and do that as it's pretty difficult for either of us to climb a step stool, get back down from the stool, plus do the other stuff that needs done on the touchscreen to remove the old sensor and add the new sensor. The touchscreen and the sensor are on different levels of our house and steps are difficult right now. Any help from a comcast employee to resolve this would be greatly appreciated.  Once again, calling for support is a very frustrating issue due to phone menus, hang ups, and long wait times then hang ups again.  Thank you