For how long can I use the myblu battery before it needs to be recharged? 11 March 2021 15:16 Updated When fully charged, the myblu battery should last for roughly 8 hours, although individual use will vary. read about caring for vape batteries: how to clean your myblu battery here. Related articles How long will it take to recharge the myblu battery? How do I know when the myblu battery needs to be recharged? How long will the myblu battery last? How do I use myblu liquidpods? What are the safety features of the myblu kit?