Helped a friend of mine convert a 4020 over from 24V to 12 V. He picked up this battery box from a previous 4020 owner. The box was made to accommodate the pair of long skinny batteries that were original equipment. Not quite what you were wanting but may give you some ideas on fabricating up your own
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 0131021105a (Medium).jpg (63KB - 640 downloads)
0131021106a (Medium).jpg (105KB - 703 downloads)
0131021302e (Medium).jpg (72KB - 671 downloads)
0131021303 (Medium).jpg (64KB - 644 downloads)
0131021304a (Medium).jpg (82KB - 650 downloads)
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John Deere 4020 add on battery box
