Even after leaving the batteries charging for over 24 hours the cell #2 is still red. Do I need a replacement? Ella at SwiftPaws March 10, 2020 15:50 Updated It sounds like you might have a bad cell. Please contact Support@SwitfPaws.com and describe your troubleshooting efforts and the results so we can best determine your needs. Thank you! Related articles My SwiftPaws is too slow - I expected it to be faster - what can I do? After I plugged the battery in the charger, it smells and is not charging. What do I do? Can I leave the course set up in my fenced and secured backyard if I cover the motorized unit with heavy plastic? Ideal Conditions for the Perfect Course. The Remote Switch does not return to center on its own anymore! How to access the spring to reposition or replace.