The Case IH 5120 tractor uses a 12-volt battery system with a published capacity of 105 Ah. Published electrical details include negative ground, Alternator (65 A).
Model5120
Years1990-1997
Voltage12 V
ConfidenceHigh
Voltage
12 V
Capacity
105 Ah
How this battery compares
Benchmarked against comparable Case IH tractors in this researched dataset.
Battery capacity105 Ah
Low
LowAverageHigh
Low 140.5 AhMedian 176 AhHigh 176 Ah
BA
Battery specification
Published model / family battery data
System voltage
12 V
Published capacity
105 Ah
Ground
Negative
CH
Charging system
Alternator and charging information
Charging system
Alternator
Charging output
65 A
ID
Model details
Identity and research coverage
Model
Case IH 5120
Equipment class
Row-crop
Series
5100 Maxxum Series
Model years
1990-1997
Research confidence
High
BUY
Choosing a replacement battery
Fit and electrical rating both matter
Match voltage, case dimensions, terminal layout and hold-down first. Keep the replacement at 12 V, but verify CCA/Ah from the tractor's battery label or service manual because the exact rating was not confirmed here.
1. Voltage
Use the verified system voltage shown above.
2. Physical fit
Match battery tray dimensions, height and hold-down style.
3. Terminals
Confirm positive/negative terminal positions before buying.
4. Starting power
Meet or exceed published CCA when a confirmed CCA is available.
5. Multiple batteries
When the tractor uses two batteries, replace weak/mismatched pairs thoughtfully and confirm the factory cable arrangement.
?
Is 105 Ah small for the Case IH 5120?
Quick answer
The published capacity is 105 Ah, toward the lower end of this class. That is not a flaw—the electrical system was designed around it. Keep replacement voltage and physical fit correct.
?
What does the Case IH 5120 65 A alternator mean?
Quick answer
The charging system is rated at 65 A. That figure tells you the system’s maximum charging/accessory output, not the current constantly forced into the battery.
Research note: Later 5120/5130 listings publish 12 V, 105 Ah and 65 A; early listing also confirms 12 V/65 A.
Disclaimer: Specifications are provided as a reference from published manufacturer, service-manual and reference information. Verify critical service values with Case IH or the correct service manual. Case IH website
