Here is Betafpv Lab video to show you the best way of replacing BT2.0 connectors. BETAFPV exclusive designed BT2.0 connector has broken through the bottle-neck of PH2.0 connector. There is a graph of comparison between BT2.0 connector and PH2.0 connector (solid pins version) in BETAFPV 1S 300mAh battery.
eBay