I have some rechargeable AA batteries at home and I have a machine that I put them in that cycles them and tells me how much capacity they can deliver. Is there such a machine or technique for lipo batteries? I know chargers can tell you how many mAh were put into the battery, but without knowing what was left remaining before I started the charge I find the information less than useful. Any ideas? I have 6 batteries in front of me and really don't know what ones might possibly be bad.