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I am looking for a DC barrel to power a battery pack. The battery in question is connected in 10S3P, that's is a nominal voltage of 36V. I am currently looking for a DC barrel that can withstand at least 42V and currents up to 2A.

I have seen some companies that charge the battery pack using a RCA plugs, however would like to avoid using them because they are not design for that. I have check DC plugs but I can hardly find that can withstand 42V or higher. However, most of them are design for 24 volts.

I was wondering if I could use them as long as I maintain the power output within the safety threshold. Let's say that the dc plug has is designed to safely withstand 24V and 5 A. Could I used with 42 volts and 3 amperes. If not, what would be your advice?

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Digikey has numerous jacks rated for 48V, 5A.

https://www.digikey.com/products/en/connectors-interconnects/barrel-power-connectors/435?FV=ffe001b3%2C70017d&quantity=0&ColumnSort=-14&page=1&stock=1&k=barrel+jack&pageSize=25&pkeyword=barrel+jack

Go to www.digikey.com and search for"barrel jack", select "Barrel - power connectors" and then use the filters to narrow down the search: Active, In stock, male/female, voltage, amps, mounting style, etc.

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    \$\begingroup\$ While this provides an off-site list of applicable products, it could become out of date if the vendor changes the URL, etc. Consider providing information to the OP about how to find satisfactory products, regardless of the specific vendor. \$\endgroup\$ – JYelton Feb 11 '19 at 15:54
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If it doesn't need to be a "barrel" type jack, Anderson PowerPole (https://en.wikipedia.org/wiki/Anderson_Powerpole) connectors would probably work quite well, as they're likely available locally, and provide the necessary isolation.

The (Anderson) suggested colour-code would be Blue (48VDC), and you can also then use the battery as both a power-source, and a power-sink (charge)

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