Charging the Lavatube 2.5 Battery When your Lavatube v2.5 reads "Lo" on the screen the 18650 battery needs to be recharged. Unscrew the Lavatube and remove the battery. Please follow the steps in Using Your Nitcore Sysmax D2 Battery Charger to charge your battery. Have more questions? Submit a request 0 Comments Please sign in to leave a comment.