problems lipo 3 s multistar 5200

good evening I bought from you 3 3s 5200 lipo mutistar today I tried but can not keep my dji f450 with gimbal weight 1000 gr hovering in 2.30 minutes after I flash battery and apterous. I'm going to reload and there Stano 1200 amps only. tried again 3 more times but to no avail downloading in 2 minutes. before I used the zippy 3000 always buy from you and I was flying safely six minutes with 2 other residues these do not last even a quarter. look your news