Li-polymer battery, the new energy provider, turns out to be widely applied to many different fields. Take the latest best-seller WLtoys V931 Battery for example, it is the battery that makes the copter play out its excellent performance. As we know, li-polymer battery could provide pretty large capacitance which ensures a longer flying, specially suitable for enthusiasts prefer flying outdoor. And the full engine power also allows you to do very difficult fancy flying, bringing very stimulating enjoyment to enthusiasts.
WLtoys V931 Battery
Perhaps you will question why I should choose WLtoys Battery. Surely, you do not have to, but you’d better choose the original battery specially designed for the copter. Cooperated with a matched charger, you can see the capacitance while it charging. As long as the capacitance could be read, there is less worry about overcharging or overdischarging. If you want long time flying, you can charge it to the maximum. Or you are hurry to go out with the copter, you can get known how much capacitance of WLtoys V931 Battery charged. Then when you fly the copter outside, you would be clearly about  how far and how long the flight should be to keep safety of the copter. It is said that the battery could be perfectly matched with the copter. If you are skillful to control the transmitter, you will experience very fast and furious flight.
WLtoys V931 Battery
Furthermore, li-polymer battery is charactered with large capacity, light weight and small volume. To some extents, WLtoys V931 Battery could help reduce a bit of load for the copter. Besides, Li-polymer is charged with constant current and voltage, meanwhile, it is equipped with a protecting circuit board to prevent the battery if any unsafe charging problem arises. In addition, the outer of li-polymer batteries is with aluminum materials, which is different from the metal shell of liquid lithium electricity. The battery will not explode but ballooning if there is any hidden problem. Finally, the internal of the battery does not contain liquid electrolyte which contains toxic heavy metals, so copter enthusiasts could trustingly use it.