Suggestion:
Battery sets could be improved to accommodate up to 4 output sockets.
Just as solar panels have a small and a large version, a battery set with 1 input and 4 outputs could be developed, but with a higher construction cost and some limitations on the maximum power it can operate with, so as not to render the existing battery set useless.
This 4-output battery could be researched in the middle or at the end of the electrical research grid.
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