Switching between battery powered and surface power (OTPS)

I’m wondering if anyone managed to make an easy switchable solution between battery and OTPS system? I would like to make a BlueROV2 that has the ability to work in both modes.
I’m normally using 4pin Cobalt (Bluetrail’s) connector and cable coming from battery housing, but the OTPS ROV power supply comes with the standard two cable for power, and unifying them to one cable into 4pin Cobalt connector will limit the power that will be possible to draw from the OTPS.
I would be happy to hear of any user-friendly solutions for that. Thanks.