You may find 580 gms is a touch heavy, mine which I've only flown about 5 batteries is 550 gms, the CoG is too far forward so rather than cutting a second hole for the battery to find that wasn't in the right place as well thought I tried some weight at the rear and whilst I appreciate the planes going to fly differently as the CoG goes back you could just tell it didn't like the extra weight and I landed it and took the weight off - flew much nicer although the CoG's still too far forward and needs quite a lot of down elevator when inverted.