The Kubota B2400 tractor uses a 12-volt battery rated at 390 CCA and 36 Ah, with 71 minutes of reserve capacity. The published battery designation is 50B24L(S)-MF. Its electrical setup uses negative ground and AC dynamo / alternator variant (4.5 A).
ModelB2400
Years1995-1999
Voltage12 V
ConfidenceHigh
Voltage
12 V
Cold cranking
390 CCA
Capacity
36 Ah
Battery size
50B24L(S)-MF
How this battery compares
Benchmarked only against other compact/subcompact tractor models in this researched Kubota dataset.
Cold cranking amps390 CCA
Low
LowAverageHigh
Low 430 CCAMedian 490 CCAHigh 560 CCA
Battery capacity36 Ah
Low
LowAverageHigh
Low 36 AhMedian 36 AhHigh 45 Ah
Reserve capacity71 min
Low
LowAverageHigh
Low 77.8 minMedian 80 minHigh 92 min
Charging output4.5 A
Low
LowAverageHigh
Low 22.1 AMedian 40 AHigh 40 A
BA
Battery specification
Published model-specific battery data
System voltage
12 V
Published cold cranking amps
390 CCA
Published amp-hour capacity
36 Ah
Ah rating basis
5-hour
Reserve capacity
71 min
Battery designation
50B24L(S)-MF
Ground
Negative
CH
Charging system
Alternator / dynamo and charging data
Charging system
AC dynamo / alternator variant
Charging output
4.5 A
RP
Replacement battery
What to match when buying
Published minimum CCA to match
390 CCA
Voltage to match
12 V
Physical fit
Match case dimensions, terminal position and hold-down
ID
Model details
Identity and research coverage
Model
Kubota B2400
Equipment class
Compact/Subcompact Tractor
Model years
1995-1999
Research confidence
High
DX
Useful derived specs
Calculated only from confirmed numeric values
Approx. stored energy
432 Wh
CCA per Ah
10.8
BUY
Choosing a replacement battery
Electrical rating and physical fit both matter
Use a 12V replacement that meets or exceeds the published 390 CCA rating, then match the original case dimensions, terminal orientation and hold-down.
1. Voltage
Keep the replacement at the verified system voltage.
2. Case size
Match tray length, width, height and hold-down style.
3. Terminal layout
Make sure the positive and negative posts are on the correct sides for the tractor's cables.
4. Starting power
Meet or exceed the published CCA when a model-specific CCA is confirmed.
5. Capacity
Match Ah and reserve capacity when those ratings are published, especially on higher-accessory-load tractors.
?
What battery size fits the Kubota B2400?
Quick answer
The published fitment is 50B24L(S)-MF. Match that designation plus the original terminal orientation, case dimensions and hold-down before buying a replacement.
?
Is 390 CCA enough for the Kubota B2400?
Quick answer
The published rating is 390 CCA. That sits toward the lower end of the compact/subcompact tractor models in this dataset, so there is little reason to chase a huge battery unless you need extra cold-weather starting margin. Match or exceed 390 CCA and focus on correct physical fit.
?
Can I use a higher-CCA battery in the Kubota B2400?
Quick answer
Yes. Moving above 390 CCA can give extra cold-start margin as long as the replacement stays 12V and the case size, terminals and hold-down fit correctly. You do not need to dramatically oversize it for normal use.
?
Is 36 Ah a small battery for the Kubota B2400?
Quick answer
The published capacity is 36 Ah, low relative to many compact/subcompact tractor models in this dataset. That is not automatically a problem—the tractor was designed around that size. A much larger Ah battery only helps if it still fits and the charging system can keep it healthy.
?
What does the 71-minute reserve capacity mean on the Kubota B2400?
Quick answer
The battery has 71 minutes of reserve capacity, on the lower side for comparable models here. Reserve capacity matters mainly when the charging system is not keeping up or accessories are used with the engine off, so keep the battery charged and healthy.
?
Is the Kubota B2400 4.5 A charging system small?
Quick answer
The charging output is 4.5 A, relatively modest for this class. After repeated short starts or heavy accessory use, the battery may take longer to recover, so lots of short run time is harder on it than a good full operating cycle.
Research note: WSM: AC-dynamo version 50B24L(S)-MF, 36 Ah, RC 71, CCA 390. Alternator-equipped B2400 uses 55B24L(S)-MF and literature shows higher CCA variant.
Disclaimer: Specifications are provided as a reference from published manufacturer, service-manual and reference information. Verify critical service values with Kubota or the correct service manual. Kubota website
