i have an axe cp. the batt. packs fail after about 5 charges. i sent the axe in for warranty sevice, they could not find anything wrong. i have it 3 weeks and gone threw 3 packs.... tech support has told me that they are having batt/charger issues... they are sending me a new charger. i'm an electronics tech personally i do not think the 10.8v batt. are right for this heli. I'm most likely going to upgrade. I'm a beginner pilot just learning to hover, battery is good for about 4 minutes...