Gaoneng 2500mAh 4S1P 12C is a Liion battery with an excellent price/performance ratio. The battery is suitable for lighter 4-5" drones where it can provide long flight time. The advantage of Liion batteries is their higher energy density - so they can offer higher capacity with less weight. However, the disadvantage is smaller discharge currents. So you need to be sensitive about the throttle. Liion batteries are thus especially suitable for calm flight - curise or long-range. We recommend landing at 2.7V per cell.