How long does the cube stay charged?

Can you tell me, how long does the cube remain fully charged after it's been powered up? I'm curious about its battery life and how long I can rely on it being operational without needing to recharge. Is there a specific duration that you can provide, or does it depend on various factors like usage or the types of tasks being performed? Additionally, what's the indicator that it's running low on power, and how does one go about recharging it efficiently?