How long do the batteries last? カスタマーセンター August 28, 2017 02:09 Updated Follow With a usage of 10 turns per day batteries will last for about one year. Related articles Will there be a notification if batteries run out? Can I still use my physical key after I have installed NinjaLock? Is Ninjalock safe? Which kind of batteries can I use? Can NinjaLock be used with a non-Japanese SIM? Comments 0 comments Article is closed for comments.