Is the P2V manual correct, recommending a new battery after only 300 charges? Battery cost of approximately $170.00 USD each divided by 300 flights is about .57 cents per flight. After 3 weeks with my P2V I must have about 50-60 flights already. And don't forget you need to completely discharge the battery every 20 flights or it's even less time on the battery life. Is this correct?