Laptop PowerBank 256wh Joshnka Laptop Powerbank is a high capacity powerbank of 80,000mAH 12.8v Lithium Iron Phosphate battery. Built with high-quality rechargeable batteries of 2500 cycles ie 7-years lifespan. This is a unique battery indeed that can power/charge your laptop for a minimum of 6hrs and up to 12hrs depending on your laptop power consumption “wattage”.