The connector plug: PH 2.0 AKA High current ultra micro, Powerwhoop, mCPX
This is newly developed chemistry for a longer lifetime and safer charging situation. This battery will give you higher rpms (more power) and a considerably longer flight time.
If your batteries get puffed, the reason can be classified into 3 parts:
First is the storage method, keep it in over-charge, or over-discharge.
Second is the charge mode, over-charge or over-discharge the battery.