You can either terminate with a crimp ring terminal and then find a battery terminal that can accommodate those ring terminals or find a battery terminal that can accommodate the two bare wire ends.
If going with #1, you can just stack the ring terminals.
There are lots of options for battery terminals that you should be able to find locally.
Most common are the ones with wing nuts on the top.
For #2, check out "car audio" type battery terminals that allow you to shove bare end stripped wire.
Most can accommodate up to 4AWG easily.
Some have multiple holes to accommodate what you're trying to do.
-Ted
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