Battery connectors. info needed.

Here is the whole category of 50 pages of them
You can buy chargers with the mate to this on them about as cheap as newark sells new ones without wires.
If you need the female, you probably have a dozen of them in the junk drawer for dead electronic devices like PC's. Cutting the NEMA 15A plug off and butt splicing a XT60 on would be what I would do. Good luck on finding an adapter. Competent butt splices are sold by Dorman at the auto supply, but use the red ones for 18 ga wire used on old PC's. Your battery connections really need 12 ga wire which is yellow, but finding a 12 ga IEC cord is as rare as those $20 Shurter power entry connectors on the newark link. One 12 ga one comes with each $1200 Peavey 1300 watt PA amplifier, and the only place I've found that sells the 12 ga ones is Peavey parts service.
Note Newark minimum freight is $10 unless you specify USPS and orders below a certain dollar amount incur a handling fee. I'm always above $50 orders so I never get one.
BTW I find all crimp connections not made with an Ideal Bulldog or Klein tool are ****. There are 99,999 other brands out there that produce garbage crimps. Making a good crimp is important at 30 amps. Also, acceptable brands of crimp connectors are TE connectivity, Panduit, T&B, Ideal, 3M & Dorman. "Just as gooe" crimp terminals sold on ali/ebay/amazon/radioshack melt out at 30 amps.
IEC connectors are registered worldwide with UL, VDE, CE, etc etc as AC power entry devices for multi-voltage appliances. ie 120 vac/240 vac appliances. As they are used on e-bikes for 48 vdc or 36 vdc they are probably in violation of those registrations, and probably no ebike that uses one for the battery would have a UL VDE or CE rating. But they are cheap, and common.

It is an IEC connector. https://www.newark.com/schurter/4301-0502/conn-fused-power-entry-module/dp/84K0270 Here is the whole category of 50 pages of them https://www.newark.com/c/connectors/power-entry-connectors/power-entry-connectors You can buy chargers with the mate to this on them about as cheap as newark sells new ones without wires.If you need the female, you probably have a dozen of them in the junk drawer for dead electronic devices like PC's. Cutting the NEMA 15A plug off and butt splicing a XT60 on would be what I would do. Good luck on finding an adapter. Competent butt splices are sold by Dorman at the auto supply, but use the red ones for 18 ga wire used on old PC's. Your battery connections really need 12 ga wire which is yellow, but finding a 12 ga IEC cord is as rare as those $20 Shurter power entry connectors on the newark link. One 12 ga one comes with each $1200 Peavey 1300 watt PA amplifier, and the only place I've found that sells the 12 ga ones is Peavey parts service.Note Newark minimum freight is $10 unless you specify USPS and orders below a certain dollar amount incur a handling fee. I'm always above $50 orders so I never get one.BTW I find all crimp connections not made with an Ideal Bulldog or Klein tool are ****. There are 99,999 other brands out there that produce garbage crimps. Making a good crimp is important at 30 amps. Also, acceptable brands of crimp connectors are TE connectivity, Panduit, T&B, Ideal, 3M & Dorman. "Just as gooe" crimp terminals sold on ali/ebay/amazon/radioshack melt out at 30 amps.IEC connectors are registered worldwide with UL, VDE, CE, etc etc as AC power entry devices for multi-voltage appliances. ie 120 vac/240 vac appliances. As they are used on e-bikes for 48 vdc or 36 vdc they are probably in violation of those registrations, and probably no ebike that uses one for the battery would have a UL VDE or CE rating. But they are cheap, and common.