The John Deere 4440 uses two 6V Group 3EH batteries with 850 CCA each.
John Deere 4440 Battery Size and Specs
Battery Setup
2 batteries
System Voltage
12 volts total
Battery Voltage
6 volts each
Battery Group Size
BCI Group 3EH
Cold Cranking Amps
850 CCA each
Amp Hour Rating
168 Ah each
Ground
Negative
Charging System
Alternator
Charging Output
61 amps ROPS / 72 amps cab
Battery Type
Heavy-duty wet charged lead-acid battery
John Deere Battery Part
TY21737B
Engine
John Deere 466 ci / 7.6L 6-cylinder diesel
What Battery Does a John Deere 4440 Use?
The John Deere 4440 uses two 6V BCI Group 3EH batteries. Each battery is rated at 850 CCA, and the two batteries work together as the tractor’s 12V starting system.
The clean factory-style replacement target is 2 × 6V Group 3EH batteries, 850 CCA each.
Do not replace only one battery unless the other one is nearly new and tests perfectly. On a two-battery diesel tractor, mismatched batteries cause weak starts and shorter battery life.
Quick Battery Specs
2x 6VBattery Setup
3EHGroup Size
850CCA Each
12VTotal System
Best Battery to Use
Two 6V BCI Group 3EH batteries
850 CCA each minimum
Heavy-duty agricultural batteries
Matched pair from the same brand and age
John Deere TY21737B or equivalent 3EH replacement
Battery Upgrade Option
The safest upgrade is a fresh matched pair of high-quality 3EH batteries. Some owners convert to 12V batteries, but that is a wiring and fitment change, not a straight factory replacement.
Best factory-style upgrade: premium 6V Group 3EH batteries with 850+ CCA. Only consider a 12V conversion if you understand the wiring, cable routing, and hold-down requirements.
Use matching batteries
Replace both batteries together
Clean and inspect crossover cables
Check starter draw if new batteries still crank slowly
Keep the original setup if you want easy, factory-style service
Battery CCA Comparison
4440 Factory
850 CCA
Premium 3EH
1000 CCA
Weak Battery
600 CCA
Battery Replacement Tips
Replace both batteries together
Use two identical 6V Group 3EH batteries
Check cable condition before blaming the batteries
Clean terminals and grounds before installation
Secure both batteries tightly to prevent vibration damage
Test alternator output if the batteries keep going flat
John Deere 4440 Electrical Specs
Ground
Negative
Total System Voltage
12V
Battery Count
2
Battery Voltage
6V each
Battery Group
BCI Group 3EH
Cold Cranking Amps
850 CCA each
Charging System
Alternator
Charging Output
61 amps ROPS / 72 amps cab
Common Mistakes
Buying one battery instead of replacing the pair
Mixing old and new batteries
Using low-CCA batteries on a large diesel tractor
Confusing the two 6V battery setup with a single 12V battery setup
Ignoring bad crossover cables, grounds, or starter draw
Summary
The John Deere 4440 uses two 6V BCI Group 3EH batteries with 850 CCA each. Together, they support the tractor’s 12V electrical system. The clean replacement is a matched pair of 6V Group 3EH heavy-duty batteries, such as the John Deere TY21737B or an equivalent 850 CCA 3EH battery.
