I use these on my 75mm whoops that can only use up to 2s batteries. I get over 5 minute flight times, no sag even down to 3.4v each cell.

GNB 450mAh HV 7.6v 2S 80C - HV Lipo XT30 Battery

Title says it all. Measured the capacity by flying down to 3.5v under load and recharging a few times and it provides 450 mAh. Great for 3" toothpicks and minimal voltage sag when punching esp. when battery is closer to full. Bought 5 of them and all have consistent quality with good wiring and plugs.

Bought three of these to try out with my Emax Tinyhawk Freestyle and tested right out of the box before any flying. See graphs, and compare to those for Tattu of the same HV variety and rated capacity. I'll give you a hint Tattu graphs are the ones with lower capacity. The one thing that goes for Tattu is they have practically no voltage difference between cells, while GNB consistently about 5-7mV apart (when not fully charged).

GNB have superior wiring, particularly for the XT30 plug. On the Tattu the wires are too skinny and the shrink wrap keeps coming off and asking for a fire. The GNB are solid.