What is a Group 34 Battery: Technical Information and Comparison with Alternatives

Group 34 Battery Dimensions

Battery Design

Dimensions and Sizes (Length x Width x Height)
10.25'' x 6.8125'' x 7.875'' Inches 260 x 173 x 200 Millimeters

Group 34 Battery Post Terminals

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

Group 34 Battery Voltage and Current Characteristics

Volts	Cells	CCA Range
12	6	235-1000

Best Group 34 Batteries

List of recommended batteries

Good Choice	Delphi BU9034 MaxStart AGM Premium Automotive Battery, Group Size 34 Cold Cranking Amps (CCA): 775, Reserve Capacity (RC): 120, Amp-Hours (AH): 50 Battery Group: 34 Type: AGM Warranty: 36 months Check Price	Check Price
Good Choice	Optima OPT8016-103 Batteries D34M BlueTop Starting and Deep Cycle Marine Battery Cold Cranking Amps (CCA): 750, Reserve Capacity (RC): 120, Amp-Hours (AH): 55 Battery Group: 34 Type: AGM Warranty: 36 months Check Price	Check Price
Good Choice	Odyssey 34-PC1500T Automotive and LTV Battery Cold Cranking Amps (CCA): 850, Reserve Capacity (RC): 134, Amp-Hours (AH): 68 Battery Group: 34 Type: AGM Warranty: 36 months Check Price	Check Price

Best Group 34 Battery Equivalents

Compatible interchangeable batteries with the same post terminal locations.

Good Choice	Optima Batteries 8004-003 34/78 RedTop Starting Battery Cold Cranking Amps (CCA): 800, Reserve Capacity (RC): 100, Amp-Hours (AH): 50 Battery Group: 34/78 Type: AGM Warranty: 36 months Check Price	Check Price
Good Choice	Odyssey 34/78-PC1500DT Automotive and LTV Battery Cold Cranking Amps (CCA): 850, Reserve Capacity (RC): 135, Amp-Hours (AH): 68 Battery Group: 34/78 Type: AGM Warranty: 48 months Check Price	Check Price
Good Choice	Optima Batteries OPT8014-045 8014-045 D34/78 YellowTop Dual Purpose Battery Cold Cranking Amps (CCA): 750, Reserve Capacity (RC): 120, Amp-Hours (AH): 55 Battery Group: 34/78 Type: AGM Warranty: 36 months Check Price	Check Price
Good Choice	ACDelco 34AGM Professional AGM Automotive BCI Group 34 Battery Cold Cranking Amps (CCA): 740, Reserve Capacity (RC): 115, Amp-Hours (AH): 50 Battery Group: 34/78 Type: AGM Warranty: 36 months Check Price	Check Price

Equivalents with the Reverse Polarity

Batteries in this section have identical sizes and a positive post terminal on the opposite RIGHT side.

Good Choice

Odyssey Batteries 34R-PC1500T Automotive/Light Truck and Van Battery Cold Cranking Amps (CCA): 850, Reserve Capacity (RC): 134, Amp-Hours (AH): 68 Battery Group: 34R Type: AGM Warranty: 36 months Check Price

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Group 34 Alternatives and Closest Battery Groups by Dimensions

Interchangeable Battery Groups for 34 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 34 Battery	10.25'' x 6.8125'' x 7.875'' in. 260 x 173 x 200 mm		12	6	"A"
Group 34R Battery	10.25'' x 6.8125'' x 7.875'' in. 260 x 173 x 200 mm Positive post on the Right		12	6	"A"

Similar Battery Groups With the Same Length, Width and Voltage

These dimensions will fit you in 99% of cases when you want to use a different battery group instead of a 34 battery since most battery compartments have a height margin and strict limitations on height and width only, which match batteries in the table below. Please check the battery compartment before you buy a battery from this group.

Battery Group Number	Dimensions	Shape	Volts	Cells	Post Terminal Type
Group 34 Battery	10.25'' x 6.8125'' x 7.875'' in. 260 x 173 x 200 mm		12	6	"A"
Group 24 Battery	10.25'' x 6.8125'' x 8.875'' in. 260 x 173 x 225 mm		12	6	"A", "A2"
Group 24R Battery	10.25'' x 6.8125'' x 9'' in. 260 x 173 x 229 mm Positive post on the Right		12	6	"A", "A2"
Group 24H Battery	10.25'' x 6.8125'' x 9.375'' in. 260 x 173 x 238 mm		12	6	"A"
Group 28 Battery	10.25'' x 6.8125'' x 9.4375'' in. 261 x 173 x 240 mm		12	6	"T"
Group 24T Battery	10.25'' x 6.8125'' x 9.75'' in. 260 x 173 x 248 mm		12	6	"A"

Closest but not Identical Size Battery Groups

Battery groups in this section below are not identical to the group 34 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 34 group.

Battery Group Number	Dimensions	Shape	Volts	Cells	Post Terminal Type
Group 34 Battery	10.25'' x 6.8125'' x 7.875'' in. 260 x 173 x 200 mm		12	6	"A"
Group 63 Battery	10.1875'' x 6.375'' x 8.875'' in. 258 x 162 x 225 mm		12	6	"A"
Group 56 Battery	10'' x 6.0625'' x 8.375'' in. 254 x 154 x 212 mm		12	6	"A"
Group 86 Battery	9.0625'' x 6.8125'' x 8'' in. 230 x 173 x 203 mm		12	6	"A"
Group 85 Battery	9.0625'' x 6.8125'' x 8'' in. 230 x 173 x 203 mm		12	6	"A"

Closest Large Dimensions

Bigger batteries can have more capacity and power compared to 34 batteries.

Battery Group Number	Dimensions	Shape	Volts	Cells	Post Terminal Type
Group 34 Battery	10.25'' x 6.8125'' x 7.875'' in. 260 x 173 x 200 mm		12	6	"A"
Group 101 Battery	10.25'' x 7.0625'' x 6.6875'' in. 260 x 179 x 170 mm		12	6	"S"
Group 78 Battery	10.25'' x 7.0625'' x 7.3125'' in. 260 x 180 x 186 mm		12	6	"S"
Group 100 Battery	10.25'' x 7.0625'' x 7.375'' in. 260 x 179 x 188 mm		12	6	"S"
Group 74 Battery	10.25'' x 7.25'' x 8.75'' in. 260 x 184 x 222 mm		12	6	"S"
Group 124R Battery	10.375'' x 7'' x 8.625'' in. 262 x 177 x 218 mm Positive post on the Right		12	6	"A"
Group 36R Battery	10.375'' x 7.1875'' x 8.125'' in. 263 x 183 x 206 mm Positive post on the Right		12	6	"A"
Group 124 Battery	10.4375'' x 6.9375'' x 8.4375'' in. 265 x 175 x 214 mm		12	6	"A"
Group 24F Battery	10.75'' x 6.8125'' x 9'' in. 273 x 173 x 229 mm		12	6	"A", "A2"
Group 46 Battery	10.75'' x 6.8125'' x 9'' in. 273 x 173 x 229 mm		12	6	"A", "A1"
Group 40R Battery	11'' x 6.9375'' x 6.9375'' in. 278 x 175 x 175 mm Positive post on the Right		12	6	"A", "A1"
Group 91 Battery	11'' x 6.9375'' x 6.9375'' in. 278 x 175 x 175 mm		12	6	"A1", "A2"
Group 48 Battery	11'' x 6.9375'' x 7.5'' in. 278 x 175 x 190 mm		12	6	"A", "A1", "A2"
Group 98R Battery	11.125'' x 6.9375'' x 7.5'' in. 283 x 175 x 190 mm Positive post on the Right		12	6	"A1", "A2"
Group 41 Battery	11.5625'' x 6.9375'' x 6.9375'' in. 293 x 175 x 175 mm		12	6	"A", "A1"
Group 27H Battery	11.75'' x 6.8125'' x 9.25'' in. 298 x 173 x 235 mm		12	6	"A"

How to Get 24 Volts from 12V of a 34 Battery Group

If you need 24 Volts, you can connect two group 34 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 34 Batteries with a Parallel Connection

If you need to increase current capacity and reduce charging time, connect batteries in parallel. When group 34 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.

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