The John Deere S140 uses a 12-volt Group U1 lawn tractor battery. The common John Deere replacement battery is TY25221B, rated at 30 Ah and 350 CCA.
The John Deere S140 is a residential 100 Series lawn tractor with electric start, a 48-inch mower deck, and a hydrostatic transmission. For reliable starting, the best replacement battery is a 12V Group U1 lawn and garden battery with around 300-350 cold cranking amps.
John Deere S140 Battery Specs
Spec
John Deere S140 Battery
Battery voltage
12 volts
Battery group size
BCI Group U1
John Deere battery part number
TY25221B
Cold cranking amps
350 CCA
Amp hours
30 Ah
Battery type
Wet charged lead-acid lawn and garden battery
Best replacement range
12V Group U1, 300-350+ CCA
Correct Size
A Group U1 battery is the correct size class for the John Deere S140.
Best CCA Range
Use at least 300 CCA. A 350 CCA battery is the better choice for stronger starting.
OEM Battery
The common John Deere replacement battery is TY25221B.
Terminal Check
Before buying, match the positive and negative terminal layout to your old battery.
Battery CCA Comparison
Basic lawn tractor battery
250 CCA
Good S140 replacement
300 CCA
John Deere TY25221B
350 CCA
Common John Deere S140 Replacement Batteries
Battery
Typical Rating
Notes
John Deere TY25221B
12V, 30 Ah, 350 CCA
OEM-style replacement
Group U1 lawn and garden battery
300-350 CCA
Common aftermarket size
Heavy-duty Group U1 battery
350+ CCA
Good for colder starts
Important: Do not buy only by voltage. Most lawn tractor batteries are 12V, but the case size, CCA rating, and terminal position still need to match the John Deere S140.
John Deere S140 Engine and Mower Specs
Spec
Details
Engine power
16.4 kW / about 22 hp
Engine type
V-twin gasoline engine
Mower deck
48-inch Edge mower deck
Transmission
Hydrostatic
PTO
Electric PTO
Starting system
Electric start
Signs the Battery Needs Replacing
Slow cranking when starting
Clicking sound when turning the key
Battery loses charge after sitting
Corrosion around the terminals
Needs frequent jump starts
Common Battery Mistakes
Buying the wrong terminal orientation
Choosing a weak battery under 300 CCA
Leaving the battery flat over winter
Not cleaning corrosion from the cable ends
Using the wrong charger or overcharging the battery
Bottom Line
The John Deere S140 takes a 12V Group U1 lawn tractor battery. For the best replacement, use a battery around 350 CCA, such as the John Deere TY25221B or an equivalent Group U1 lawn and garden battery with the same terminal layout.
