"Roughly 12 to 15 hours of recording. On average, I use it 10-20 times per day to record 3-6 second thoughts. That’s up to 2 years of usage." They really don't seem have tested the battery life, so 2 years is probably the best case scenario here. He says there's no subscription but if you need to buy one every 2 years or less, then that's the subscription. The primary reason given for not having an option to charge is just awful: "You would probably lose the charger before the battery ran out". This is seriously a device for reviewers and youtubers to hype, make a video about it, and then it's gone.