• Puff count = rough estimate based on standard draw length.
• Battery indicators = simple LED lights showing general charge level.
• Track your usage if there's no indicator.
• Check the specs (battery mAh, e-liquid mL) when buying.
• Watch for signs like weaker vapor or muted flavor to know when you're running low.

Remember, every device is different. The best way to know your device is to use it and learn its quirks. Over time, you'll get a feel for how long it lasts and when it's about to die.

This guide is for adult vapers 21+. Always follow local laws and regulations regarding vaping products.