I ordered and received this battery. Was dead. I was told it could take 24-48 hours to fully charge-not by seller, but by google search. Why I don’t know. It’s been 72 hours. Had to call the pros. ADT says this battery is dead. So lots of waiting for the battery. Lots of wasted time. And can’t even get a message to them for a refund. Never again! Example of the cheap turns out expensive!