This Sony NP-FW50 dummy battery to 3-pin Fischer cable was designed to be used with (although not exclusively) the Tilta Universal Battery Plate. It allows you to power cameras that use Sony NP-FW50…
Tilta - Power Solutions, Rubber Monkey
TILTA UBP-V V-Lock Battery Plate V Mount Power Supply System For SONY FS5 FS7 RED DSMC2 ARRI BMPCC 4K 6K Film Cameras - AliExpress
Ulanzi Np-fw50 Dummy Battery Adapter
SmallRig DC5521 to NP-FW50 Dummy Battery Charging Cable, Dummy Battery for Sony A5000/5100/6000/6100/6300/6500/A7/A7 II Camera, Designed for SmallRig 3168-2921 : Electronics
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Cables
USB Type-C to DC Cable NP-FW50 Dummy Battery Power Adapter for Sony A7RII A6400
TILTA Sony NP-FW50 (A6/A7 Series) Dummy Battery to P-TAP Cable - VideoKing EU Store
Cables
Ulanzi Np-fw50 Dummy Battery Adapter