How long is the battery life? カスタマーセンター October 25, 2017 08:23 Updated Follow The batteries will last for about an year with 10 operations per day. Related articles How can I check the remaining battery life? What kind of batteries should I use? I can't figure out how to insert the batteries. The application shows that the NinjaLock is not found, and I can not register my new NinjaLock. Can I operate the NinjaLock from devices other than a smartphone or tablet? Comments 0 comments Please sign in to leave a comment.