After many flight on you micro, will you find that the power of helicopter decrease? It may due to the depreciation of motor or battery, let's see how to solve the problem. How we know the motor or battery have problems? You can compare the flight time, when your helicopter is at the good condition, it can always have a flight more than five minutes, also it only takes less than one hour to fully charge it. When you find your helicopter only fly one to two minutes and need more time to charge, that means your battery may have problem.