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? How is the security level? Can I use manganese batteries? What kind of batteries should I use? Can I operate the NinjaLock from devices other than a smartphone or tablet? Comments 0 comments Please sign in to leave a comment.