Racepow 4000mAh 6S1P 10C is a Li-ion battery with an excellent price/performance ratio. The battery is suitable for 5-7" drones, where it can provide long flight times. The advantage of Li-ion batteries is their higher energy density – they can offer higher capacity at a lower weight. However, a disadvantage is their lower discharge currents, so throttle control should be handled with care. Li-ion batteries are best suited for smooth flying – cruising or long-range flights. The minimum voltage per cell is 2.5V, but we recommend landing with a slight reserve at approximately 2.7V per cell.