MyQ garage door opener battery replacement 

Wrestling the battery out of that packaging should be a separate tutorial video. My goodness.

Thanks Two years for the original one to die. The best garage door opener ever

How long did the battery last before it died?

I followed your instructions and it did not work, your tip suppose to take some of the situations where you need to test it or do something else, at leat you could make it work to show it really works. I foud some other tips where they push the lower tab 5 times to make it work