What is a Group 27R Battery: Technical Information and Comparison with Alternatives

Group 27R Battery Dimensions

Battery of this group has the positive post terminal located on the right. It is marked with the letter "R" because this post terminal position is called Reverse Polarity of Battery. Most batteries have it on the left side. If you want the positive post terminal to be on the left, you can turn around the 27R battery and use it as a group 27 battery, because they have identical dimensions. This will allow you to use the positive post on the left. Make sure you have enough cable length to reach the terminals, because in the turned position the terminals can be located a little further.

Battery Design

Dimensions and Sizes (Length x Width x Height)
12.0625'' x 6.8125'' x 8.875'' Inches 306 x 173 x 225 Millimeters

Group 27R Battery Post Terminals

Post Terminal Types and Locations	Posts Used
	Type "A", "A2" or manufacturer's custom post design

Group 27R Battery Voltage and Current Characteristics

Volts	Cells	CCA Range
12	6	270-700

Equivalents with the Opposite Polarity

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

Good Choice	VMAX XTR27-110 AGM Marine Battery 12V 110Ah Group 27 Sealed Deep Cycle High Performance Reserve Capacity (RC): 220, Amp-Hours (AH): 110 Battery Group: 27 Type: AGM Warranty: 12 months Check Price	Check Price
Good Choice	Banshee Marine Battery Replaces D27M 8027-127 Group 27 Cold Cranking Amps (CCA): 800, Reserve Capacity (RC): 114, Amp-Hours (AH): 77 Battery Group: 27 Type: Lead-Acid Warranty: 24 months Check Price	Check Price

Group 27R Alternatives and Closest Battery Groups by Dimensions

Interchangeable Battery Groups for 27R 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 27R Battery	12.0625'' x 6.8125'' x 8.875'' in. 306 x 173 x 225 mm Positive post on the Right		12	6	"A", "A2"
Group 27 Battery	12.0625'' x 6.8125'' x 8.875'' in. 306 x 173 x 225 mm		12	6	"A", "A2"

Closest but not Identical Size Battery Groups

Battery groups in this section below are not identical to the group 27R 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 27R group.

Battery Group Number	Dimensions	Shape	Volts	Cells	Post Terminal Type
Group 27R Battery	12.0625'' x 6.8125'' x 8.875'' in. 306 x 173 x 225 mm Positive post on the Right		12	6	"A", "A2"
Group 27H Battery	11.75'' x 6.8125'' x 9.25'' in. 298 x 173 x 235 mm		12	6	"A"
Group 64 Battery	11.625'' x 6.375'' x 8.875'' in. 296 x 162 x 225 mm		12	6	"A"
Group 46 Battery	10.75'' x 6.8125'' x 9'' in. 273 x 173 x 229 mm		12	6	"A", "A1"
Group 24F Battery	10.75'' x 6.8125'' x 9'' in. 273 x 173 x 229 mm		12	6	"A", "A2"

Closest Large Dimensions

Bigger batteries can have more capacity and power compared to 27R batteries.

Battery Group Number	Dimensions	Shape	Volts	Cells	Post Terminal Type
Group 27R Battery	12.0625'' x 6.8125'' x 8.875'' in. 306 x 173 x 225 mm Positive post on the Right		12	6	"A", "A2"
Group 79 Battery	12.0625'' x 7.0625'' x 7.375'' in. 307 x 179 x 188 mm		12	6	"S"
Group 77 Battery	12.0625'' x 7.25'' x 8.75'' in. 306 x 184 x 222 mm		12	6	"A"
Group 65 Battery	12.0625'' x 7.5625'' x 7.5625'' in. 306 x 192 x 192 mm		12	6	"A"
Group 66 Battery	12.0625'' x 7.5625'' x 7.6875'' in. 306 x 192 x 194 mm		12	6	"A"
Group 94R Battery	12.4375'' x 6.9375'' x 7.5'' in. 315 x 175 x 190 mm Positive post on the Right		12	6	"A1", "A2"
Group 27F Battery	12.5'' x 6.8125'' x 8.9375'' in. 318 x 173 x 227 mm		12	6	"A", "A2"
Group GC12 Battery	12.875'' x 7.1875'' x 10.875'' in. 327 x 183 x 277 mm		12	6	"LPT", "HPT", "UT", "LT"
Group 31A Battery	13'' x 6.8125'' x 9.4375'' in. 330 x 173 x 240 mm		12	6	"A", "M", "M1"
Group 31T Battery	13'' x 6.8125'' x 9.4375'' in. 330 x 173 x 240 mm		12	6	"T", "M", "M1"
Group 43 Battery	13.125'' x 6.9375'' x 8.0625'' in. 334 x 175 x 205 mm		12	6	"A", "A1"
Group 76 Battery	13.125'' x 7.0625'' x 8.5'' in. 334 x 179 x 216 mm		12	6	"S"
Group 33 Battery	13.3125'' x 6.8125'' x 9.375'' in. 338 x 173 x 238 mm		12	6	"A"
Group 30H Battery	13.5'' x 6.8125'' x 9.25'' in. 343 x 173 x 235 mm		12	6	"A"

How to Get 24 Volts from 12V of a 27R Battery Group

If you need 24 Volts, you can connect two group 27R 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 27R Batteries with a Parallel Connection

If you need to increase current capacity and reduce charging time, connect batteries in parallel. When group 27R 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.