You need this VE.Can to CAN bus BMS cable from Victron (MPN ASS030710018) to connect a non-Victron CAN bus-capable battery to a Victron GX device. The cable, with a length of 1.8m, corresponds to type A, which can be used for the following batteries:

BYD B-Box
Pylontech US2000C / US3000C / Force-L
Installation
The side labeled "CAN-Bus BMS" is plugged into the battery. The other side labeled "VE.Can" must be connected either to the VE.Can port of the GX device or to the BMS CAN port. Both port types of a GX device can be configured for use with a third-party CAN bus battery connected to a BMS. Refer to the manual for the battery you are using for configuration information.

Scope of delivery:

1x Victron VE.Can to CAN bus BMS type A cable 1.8m (ASS030710018)