Group U1 Battery Dimensions, Equivalents, Compatible Alternatives (2024)

Group U1 Battery Dimensions

Battery Design

Group U1 Battery Post Terminals

Post Terminal Types and Locations	Posts Used
	Type "X" or manufacturer's custom post design

Group U1 Battery Voltage and Current Characteristics

Best Group U1 Batteries

List of recommended batteries

Good Choice	EverStart Lead Acid Lawn & Garden 230 CCA Battery, Group Size U1 Cold Cranking Amps (CCA): 230, Battery Group: U1 Type: SLA Warranty: 3 months Check Price	Check Price
Good Choice	EverStart Lawn and Garden 340 CCA Lead Acid Battery, Group Size U1 Cold Cranking Amps (CCA): 340, Battery Group: U1 Type: SLA Warranty: 3 months Check Price	Check Price
Good Choice	Chrome Battery 12V 35Ah Group U1 Deep Cycle Sealed Battery Amp-Hours (AH): 35 Battery Group: U1 Type: SLA Warranty: 18 months Check Price	Check Price
Good Choice	Mighty Max ML-U1 12V 200CCA Battery for Craftsman 25780 Lawn Tractor and Mower Cold Cranking Amps (CCA): 200, Battery Group: U1 Type: SLA Warranty: 12 months Check Price	Check Price
Good Choice	12V 35AH Group U1 Deep Cycle Sealed Battery Amp-Hours (AH): 35 Battery Group: U1 Type: SLA Warranty: 12 months Check Price	Check Price

Group U1 Alternatives and Closest Battery Groups by Dimensions

Interchangeable Battery Groups for U1 Battery

These groups have the same dimensions and performance but can have different terminal post types, post locations, and polarity.

Battery Group Number	Dimensions	Shape	Volts	Cells	Post Terminal Type
Group U1 Battery	7.75'' x 5.1875'' x 7.3125'' in. 197 x 132 x 186 mm		12	6	"X"
Group U1R Battery	7.75'' x 5.1875'' x 7.3125'' in. 197 x 132 x 186 mm Positive post on the Right		12	6	"X"

Closest but not Identical Size Battery Groups

Battery groups in this section below are not identical to the group U1 battery, they can be a little bigger or smaller. Please pay attention to the post terminal types and their location

Closest Groups that Have Slightly Smaller Dimensions

Smaller batteries can have less capacity, performance, and power in comparison with U1 group.

Battery Group Number	Dimensions	Shape	Volts	Cells	Post Terminal Type
Group U1 Battery	7.75'' x 5.1875'' x 7.3125'' in. 197 x 132 x 186 mm		12	6	"X"
Group 151R Battery	7.4375'' x 4.9375'' x 8.875'' in. 188 x 125 x 225 mm Positive post on the Right		12	6	"A"
Group U2 Battery	6.3125'' x 5.1875'' x 7.125'' in. 160 x 132 x 181 mm		12	6	"A3", "X"
Group 400 Battery	5.875'' x 3.4375'' x 5.625'' in. 150 x 88 x 143 mm		12	6	"AuxTerminal"
Group 401 Battery	5.875'' x 3.4375'' x 5.125'' in. 150 x 88 x 130 mm		12	6	"AuxTerminal"

Closest Large Dimensions

Bigger batteries can have more capacity and power compared to U1 batteries.

Battery Group Number	Dimensions	Shape	Volts	Cells	Post Terminal Type
Group U1 Battery	7.75'' x 5.1875'' x 7.3125'' in. 197 x 132 x 186 mm		12	6	"X"
Group 57 Battery	8.0625'' x 7.1875'' x 6.9375'' in. 205 x 183 x 177 mm		12	6	"A"
Group 102R Battery	8.125'' x 6.9375'' x 5.5'' in. 207 x 175 x 139 mm Positive post on the Right		12	6	"A"
Group 99 Battery	8.125'' x 6.9375'' x 6.9375'' in. 207 x 175 x 175 mm		12	6	"A1"
Group 99R Battery	8.125'' x 6.9375'' x 6.9375'' in. 207 x 175 x 175 mm Positive post on the Right		12	6	"A1"

How to Get 24 Volts from 12V of a U1 Battery Group

If you need 24 Volts, you can connect two group U1 batteries in series to double the voltage. The voltage of a series connection is equal to the sum of the voltages of all its batteries. If one 12V lead-acid battery is connected to another 12V lead-acid battery, you have 24V total power output. Each battery must be fully charged and completely isolated from the other before connecting them in series, or there will be damage to at least one of them.

Increasing a Capacity of U1 Batteries with a Parallel Connection

If you need to increase current capacity and reduce charging time, connect batteries in parallel. When group U1 batteries are in parallel, their voltage is equal to the voltage of one battery, while current capacity equals to the sum of all its battery capacities. If you have two 12V lead-acid batteries with 60 Ah capacity and you connect them in parallel, you'll get 12 Volts with 120 Ah.