You can monitor your level of charge by the colour of the battery indicator:

• Blue: 20-100% remaining
• Orange: 5-19% remaining
• Red: 0-4% charge remaining

A red battery indicator light means that you should recharge your battery as soon as possible. Because you can charge your blu while it's still fully assembled, vaping is possible while your device is being charged. For your safety, do not blow into or subject your device to high heat or pressure.