The John Deere 40A battery size is listed as Group 1, 6 V, 1150 CCA.
Battery sizeGroup 1
Voltage6 V
CCA1150 CCA
John Deere 40A Battery Specs
Battery size / group
Group 1
Battery voltage
6 V
Battery CCA
1150 CCA
Battery Spec Comparisons Chart
CCA comparison
This model
1150 CCA
Average
851.24 CCA
Low
150 CCA
High
1400 CCA
Voltage comparison
This model
6 V
Average
11.94 V
Low
6 V
High
12 V
John Deere 40A Battery FAQ
Replacement battery recommendation
The best replacement battery for the John Deere 40 U1 Lawn Mower and Tractor is the AJC-U1-300-198418, which is a sealed lead acid (AGM) battery designed for reliable performance. It is maintenance-free and arrives fully charged and ready to install
Battery voltage
The official battery voltage for the John Deere 40A tractor is typically 12 volts. For optimal performance, the charging voltage should ideally be around 14.2 volts when the engine is running
Battery group size
The official battery group size for the John Deere 40A tractor is BCI Group Size 1. This size is typically used for older models like the 40A, which originally operated on a 6-volt system
Battery CCA
The recommended official John Deere 40A tractor battery has a Cold Cranking Amps (CCA) rating of 1150 CCA
Battery location
The battery on the John Deere 40A tractor is located underneath the right access step; on tractors with step lighting, you must first open the cover and disconnect the light connector before removing the step
Battery replacement steps
To replace the battery on a John Deere 40A tractor, locate the battery under the right access step, then remove the access step by unscrewing it if necessary. After that, disconnect the battery terminals, remove the old battery, and install the new one, reconnecting the terminals securely
Bad battery symptoms
Common symptoms of a failing battery in a John Deere 40A tractor include hard starting or no response when trying to start, rapid battery drain, and visible corrosion on battery terminals. Additionally, issues with the charging system can also indicate battery problems
Official information note
Mistakes do happen. Please check official deere.com website for official information.
