Lawn Mower Battery size guide (with easy to use size charts)

February 21, 2022March 5, 2024 by Thomas Vandepitte

Is it just about the right time for you to replace your lawn mower battery? Or maybe it’s the lawn tractor battery that needs replacement? For all internal combustion engines, there must be a battery to help crank or start the engine before it gets to work. Most people find it difficult to determine the right size of small engine batteries, the right dimensions, and other properties of the battery that matter when it comes to buying a new battery. Check the specifications on your Lawn Mower of tractor to determine the correct battery in the below lawn mower battery size charts.

The Battery Council International (BCI) has standardized lawn mower batteries into the 12-Volt batteries group U1 format but even with that in mind, these batteries will still differ in other battery characteristics.

To be on the safe side while choosing the right size of your lawnmower, there are two other battery properties that need to match your engine specifications and that is; the cold-cranking amps and the battery terminal position of the battery in lawnmowers i.e the position of the positive terminal and the negative battery terminal with respect to the battery cables.

If you need to replace your Lawn Mower Tires, check the Tires Size Chart here

Related smaller battery sizes: Battery Size Chart : what are the sizes of batteries?

Lawn Mower Battery Size – 12volts 100ah Lithium Iron Phosphate Battery

Model	Voltage (v)	Battery Capacity (AH)	Maximum Charge Current(Amperes)	Weight in (kgs and Pounds	Battery Physical Dimensions in (mm and inches) Length	Width in (mm and inches)	Height in (mm and inches)	Battery Cycle Life
B-LFP 12-40	12v	40ah	20A	6 kgs 13.22 pounds	195 mm 7.677 inches	130 mm 5.118 inches	168 mm 6.614 inches	>2000
B-LFP 12-50	12v	50ah	30A	7 kgs 15.43 pounds	229 mm 9.015 inches	138 mm 5.433 inches	213 mm 8.385 inches	>2000
B-LFP 12-80	12v	80ah	30A	12.8 kgs 28.219 pounds	262 mm 10.315 inches	167 mm 6.574 inches	212 mm 8.346 inches	>2000
B-LFP 12-100	12v	100ah	50A	14 kgs 30.86 pounds	323 mm 12.716 inches	173 mm 6.811 inches	218 mm 8.582 inches	>2000
B-LFP 12-120	12v	120ah	60A	16 kgs 35.27 pounds	323 mm 12.716 inches	173 mm 6.811 inches	218 mm 8.582 inches	>2000
B-LFP 12-150	12v	150ah	75A	24 kgs 52.91 pounds	485 mm 19.094 inches	172 mm 6.771 inches	240 mm 9.448 inches	>2000
B-LFP 12-170	12v	170ah	85A	26 kgs 57.32 pounds	485 mm 19.094 inches	172 mm 6.771 inches	240 mm 9.448 inches	>2000
B-LFP 12-200	12v	200ah	100A	30 kgs 66.138 pounds	520 mm 20.472 inches	269 mm 10.590 inches	205 mm 8.070 inches	>2000
B-LFP 12-240	12v	240ah	120A	34.2 kgs 75.398 pounds	520 mm 20.472 inches	269 mm 10.59 inches	208 mm 8.188 inches	>2000
B-LFP 24-50	24v	50ah	25A	14.8 kgs 32.628 pounds	520 mm 20.472 inches	380 mm 14.960 inches	290 mm 11.417 inches	>2000
B-LFP 24-100	24v	100ah	50A	28 kgs 61.729 pounds	520 mm 20.472 inches	450 mm 17.716 inches	350 mm 13.779 inches	>2000
B-LFP 24-150	24v	150ah	50A	42 kgs 92.59 pounds	520 mm 20.472 inches	450 mm 17.716 inches	400 mm 15.748 inches	>2000
B-LFP 24-200	24v	200ah	50A	56 kgs 123.459 pounds	520 mm 20.472 inches	380 mm 14.960 inches	290 mm 11.417 inches	>2000
B-LFP 24-250	24v	250ah	50A	70 kgs 154.324 pounds	600 mm 23.622 inches	450 mm 17.716 inches	350 mm 13.779 inches	>2000

Lawn Mower Battery size by Group and units with 7 of the most common heavy duty battery case sizes and specs. — Lawn Mower Battery size by Group and units

Many of these batteries fit in brands like kubota, john deere, …

Most Popular Lawn Mower Battery Sizes and Features Chart

Battery Size	Dimensions in (inches and mm)	Battery Capacity	Batteries Cold Cranking Amps (CCA)	Weight in (kgs and pounds)
YTX5L-BS	4.4375 by 2.75 by 4.125 inches	4 Ah (10h)	70 to 80	1.5 to 2 kgs 3.3 to 4.5 pounds
YTX9-BS	5.875 by 3.4375 by 4.125 inches 150 by 87 by 105 mm	6 to 8 Ah (10h)	120 to 180	2.7 to 3.7 kgs 6 to 8 lbs
YTX12-BS	5.875 by 3.5 by 5.125 inches 150 by 88 by 130 mm	10 Ah (10h)	160 to 210	3.1 to 4.5 kgs 7 to 10 lbs
YTX14-BS	5.875 by 3.4375 by 5.75 inches 150 by 87 by 146 mm	12 to 14 Ah (10h)	190 to 235	3.6 to 5 kgs 8 to 11 lbs
YTX20L-BS	6.875 by 3.4375 by 6.125 inches 175 by 87 by 155 mm	14 to 20 Ah (10h)	220 to 330	5 to 6.4 kgs 11 to 14 lbs
YTX24HL-BS	8.0625 by 3.4375 by 6.375 inches 205 by 87 by 162 mm	21 Ah (10h)	300 to 350	5.9 to 8.2 kgs 13 to 18 lbs
YTX30L-BS	6.5625 by 4.9375 by 6.875 inches 166 by 126 by 175 mm	30 Ah (10h)	360 to 400	7.7 to 10 kgs 17 to 22 lbs
U1 & U1R	7.75 by 5,1875 by 7.3125 inches 197 by 132 by 186 mm	35 Ah (20h)	300 to 320	10 to 11.8 kgs 22 to 26 lbs

Group U1 & U1R Battery Equivalents and Replacement Sizes Chart

Even though the basic battery like lead-acid batteries are still available in the market, there are other battery technologies like lithium batteries, the AGM, and gel-cell batteries (Absorbed Glass Mat is an advanced technology lead-acid battery) with no battery maintenance due to vibration resistance

Battery Model	Battery Type	Battery Chemistry	20h Capacity	Discharge Characteristics	Weight in (kgs and lbs)
Deka 8AMU1R	Starting	AGM	–	320 CCA; 45 min RC (25 Amps, to 10.5v)	11.3 kgs 25 lbs
Expert Power EXP 12330	Deep Cycle	AGM	33(10h)	21.09 Amps; 60 minutes, down to 10.5v	10.8 kgs 23.8 lbs
Mighty Max ML35-12	Deep Cycle	AGM	37	330 Amps (5 s); 17.2 Amps, 60 minutes, down to 10.5 volts	10.5 kgs 23.1 lbs
MotoBatt MBU1-35	Deep Cycle	AGM	35	–	11.8 kgs 26 lbs
Power-Sonic PS-12350	Deep Cycle	AGM	35	350 Amps (10 s); 25 Amps, 60 minutes, down to 9 volts	11.2 kgs 24.7 lbs
SigmasTek SP12-35	Deep Cycle	AGM	35	–	11.2 kgs 24.7 lbs
VMAXTANKS V35-857	Deep Cycle	AGM	35	300 CCA; 75 min RC (25 Amps, down to 10.5 v)	11.3 kgs 25 lbs
Weize LFP1235	Deep Cycle	AGM	35(10h)	350 Amps(5 s); 20.4 Amps, 60 min, down to 10.5 volts	10.5 kgs 23.2 lbs
Chrome U1 Battery	Deep Cycle	AGM	35	525 Amps (5 s)	10.7 kgs 23.5 lbs
Everlast 12350DC-NB	Deep Cycle	AGM	35	–	10.7 kgs 23.5 lbs
Interstate Batteries DCM0035	Deep Cycle	AGM	35	–	10.4 kgs 22.9 lbs
Mighty Max ML-U1-CCAHR	Dual Purpose	AGM	18(10h)	320 CCA; 20 Amps, 30 min, down to 9.6 volts	6.6 kgs 14.57 lbs
NPP NP12-35Ah	Deep Cycle	AGM	35	–	10.5 kgs 23.1 lbs
PowerStar PS12-35-D	Deep Cycle	AGM	35	–	10.4 kgs 23 lbs
Universal UB12350	Deep Cycle	AGM	35	315 CCA; 18 Amps, 60 min, down to 10.5 volts	11.1 kgs 24.4 lbs
VMAXTANKS VPG12C-50Li	Deep Cycle	Lithium	50	150 Amps (3 s); 100 Amps (5 s), 50 Amps Continuously	5.4 kgs 12 lbs

How to choose the best lawn mower battery size?

What’s the best Lawn Mower Battery Size for my Machine?

Remember something when choosing the right battery size when considering the cold-cranking amps, going below the recommended CCA will reduce the minimum expected battery life while at the same time going for a higher CCA rating has no practical advantage in any way and it might actually mess with the battery management system. The best choice would be to stick to the stipulated cold-cranking amps battery.

Lawn Mower Battery sizes and replacement explained

Does Lawn Mower Battery Size matter? Yes it does, by RedneckComputerGeek

Conclusion

Depending on the battery age, which for most batteries will go up to 3 or 4 years, the battery output after a period of time starts to drop. Other factors like battery acid spill, extended storage periods without using the lawnmower especially during cold temperature seasons or battery storage in sub-freezing temperatures, vibration damage with wet cell batteries, all these factors may negatively impact the general battery condition forcing you to go for a quick replacement.

A full understanding on battery sizes charts you can read here

To get improved performance with ample power from your battery, just remember the battery tips provided in this article regarding batteries – exact battery size i.e the physical size as well as matched-up battery properties as recommended by the lawnmower manufacturer.

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Picture in this post by Clayton Cardinalli on Unsplash