Yea DJI charges premium prices but the dji 3 battery charger is the only one that I have found that charges automaticaly the recommended storage charge capacity. I have 4 batteries and paid in Canadian dollars, they cost me over $1000.00 for the 4 so $120.00 for a good charger is cheap if they will help long term battery life. The temperature where I live will drop down to 30 to 40 below here so flying will be on hold and I will have to store for some time. Sad days are comming but then I will snowmobile to my hearts content in some real real nice trails.