in my prior reviews, I stated that the motor was losing power. Although that is the case, it is on a much smaller slope than I anticipated. It was because the stock charger was junk. Here's why. The battery is a 180 mah battery, meaning it should charge at about 20-30 mah, and the charger has it at about 100, which will cause the battery to become puffy with charging. Another thing, is that it charges the battery to 4.4V, when it should charge it to 4.2V. This is very dangerous and will cause the battery cell to potentially break open. What I did, was went onto amazon, and bought a 3.7v 350 mah pack, and the motor works like new. I am talking about this after just coming out of a devastating crash with this airplane. The reciever and the transmitter lost the link, which does happen sometimes, and it started a nose dive about 100 feet above the ground, slamming into a light pole in the parking lot I was flying in, and then twirling down onto the ground. I did walk away with it mostly intact, and with a spare prop buy, it will be back in the air soon. anyway, I am charging my new pack with a 3.7v 25c dromida lipo charger.