The John Deere 4020 battery size is listed as Group 31, 6 V, 13 × 6.81 × 9.44 in.
Battery sizeGroup 31
Voltage6 V
Case size13 × 6.81 × 9.44 in
John Deere 4020 Battery Specs
Battery size / group
Group 31
Battery voltage
6 V
Battery dimensions
13 × 6.81 × 9.44 in
Battery Spec Comparisons Chart
Voltage comparison
This model
6 V
Average
11.54 V
Low
6 V
High
24 V
Case length comparison
This model
13 in
Average
11.3 in
Low
9.38 in
High
13 in
John Deere 4020 Battery FAQ
Replacement battery recommendation
A Group 31 or larger battery is recommended for a John Deere 4020 tractor, with properly built battery boxes and beefy new cables for best performance
Battery voltage
The original John Deere 4020 came from the factory with two 6-volt batteries wired in series for a 12-volt system
Battery group size
The official battery group size for the John Deere 4020 tractor is Group 31. This size is suitable for converting to a single 12V battery setup
Battery CCA
The recommended official John Deere 4020 tractor battery has a Cold Cranking Amps (CCA) rating of 900. This ensures reliable starting performance, especially in cold conditions
Battery location
The battery on the John Deere 4020 tractor is typically located underneath the right access step. You may need to open the flap and possibly remove the access step to access the battery
Battery replacement steps
To replace the battery on a John Deere 4020 tractor, disconnect and remove the old batteries, then install the new 12-volt batteries in parallel, ensuring they are properly secured in the battery boxes. Make sure to connect the positive and negative leads correctly to the corresponding terminals. Sciencing
Official information note
Mistakes do happen. Please check official deere.com website for official information.
