Rc Helicopter What Is The Charge Time On A 3.7V 400mAh Lipo Battery For An RC Helicopter?

What is the charge time on a 3.7V 400mAh Lipo battery for an RC helicopter? - rc helicopter

I bought a micro Walkera 4 # 3B RC Helicopter and Lama Walkera 2-1. I was curious how long a battery is 3.7V 400mAh Lipo needed to fully recharge?