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There are different types of batteries used in cars. The most commonly used batteries are group 29 and group 31. Group 29 is more commonly used in newer vehicles whereas group 31 is most commonly used in older vehicles.
In this guide, you’ll learn,
- A significant difference between group 29 vs group 31 batteries.
- AMP, Weight, Length, time capacity of group 29 vs group 31.
- And much more!
Quick Note: If you are in a hurry!
Group 29 Vs Group 31 Battery Overview
|Name||Group 29 battery||Group 31 battery|
|Weight||55 to 61 lbs.||30 to 80 lbs.|
|Capacity||65 to 120||20h capacity in 75-125 Ah range|
|CCA||650 to 850||750 to 1250|
|RC||120 to 210 minutes||150 to 250 minutes|
Quick Check Out Between 2 Products
|THE WINNER||Odyssey Group 31 Heavy Duty Commercial Battery||Check Today’s Price|
|RUNNER-UP||Interstate Batteries 12V AGM Deep Cycle Battery||Check Today’s Price|
Differences Between Group 29 And Group 27 Deep Cycle
Both the deep cycle batteries look quite similar but there are a lot of things that are different between these batteries. You will find some significant differences between these two if you carry out more in-depth research.
Size and Weight
When it comes to comparison size and weight are the two most important facts. With its dimension of 330 x 173 x 240 mm, group 31 batteries are larger than group 29. 12-volt group 29 batteries weigh around 55 lbs. to 61 lbs.
On the other hand, group 31 batteries weigh around 30 lbs. to 80 lbs. Here you will find a huge difference between the size and weight.
The higher weight and size the higher performance and capacity will be. So, choose which one you need. The best way is to calculate your power need and select an ideal battery for the vehicle is to aim higher to have a battery of the right size.
Capacity refers to the specified amount of current that the battery is capable of delivering over a specific period of time. The higher the capacity of the battery, the longer it can hold and release electricity. Group 29 offers a capacity of 65 to 120 Ah.
But the group 31 batteries are more powerful. It features a 20h capacity the in 75-125 Ah range. Group 31 has a better capacity than 29. So, when you camp off-grid then 31 will be better to opt for a powerful battery with higher capacity.
Cold Cranking Amps
Higher CCA in the battery is a must while driving in cold weather or living in a cold place. When the temperature in your area goes down, you won’t get the required amps to start the car’s engine. Group 29 offers a CCA of 650-850 Amp. However, group 31 provides 750 to 1250 CCA. On the CCA scale group 31 is better for drivers.
Revers capacity is always necessary for long drives. In some moments your car battery doesn’t charge while driving. So, you will be out of power to run the electric system in the car. It can be a huge problem. To avoid such a scenario, the deep cycle comes with backup minutes.
Group 29 offers 120-210 backup minutes RC but group 31 offers 150-250 minutes. You will get better RC with group 31. So, you can run the systems for longer. If your car doesn’t require a lot of amps, then you can go for a group 29 deep cycle that features a small capacity. Besides, you can save some money too.
Depth of discharge
Depth of discharge means a specific amount of power discharged by the battery in the form of a percentage over time. The deep cycle of a battery and depth of discharge is correlated. The deeper cycles lead to fewer cycles. So, take a battery that can optimize its life cycle when the depth of discharge is high. Group 31 offers more depth than group 29.
Fit perfectly with your vehicle
Not all group 29 and group 31 batteries would fit under your car hood. You will get different sizes and dimensions of batteries that fit with your car manufacturer. So, the first thing you need to check out is the dimension of the battery.
Find out the perfect size and see if it fits with your vehicle. Besides the fitting, you also need to make sure if the battery is capable of powering up the car.
For that, you need to know what amp battery can provide maximum performance. Group 31 battery is quite bigger than group 29. But it offers more power. If the size is not an issue then go for Group 27 battery.
Both group 29 and group 31 charging system is easy. There are many ways to charge these two batteries. Among the popular ones are generators, solar power, and shore power. It depends upon the availability of a power source for charging it.
You may get three power sources at a time for this you need a smart charger or charge controller. With the help of these devices, you can charge the battery without compromising the correct charging method. A smart charger can be helpful in automatically adjusting the voltage as well as current. Group 31 is better than group 29 in charging.
The group 29 and group 31 batteries will vary in price. The most important thing to remember about the price is that the price you pay should be stretched out over time. While there are some great lower-priced car batteries, a lot of the truly inexpensive ones will need to be replaced on a more frequently scheduled.
Group 31 is a little bit costly but more cost-effective than group 29. So, if there is no money issue, it’s worth it to spend it on a car battery that you won’t have to replace every couple of years.
Convenience in All Weather
When you get a new battery that means you don’t have to worry if your car will start no matter what the weather is like. These two batteries will always support you even in extreme weather. Both group 29 and group 31 have higher CCA. Having a higher CCA number is better. Because the cold cranking apps enable your car to start in 0-degree weather.
Group 29 battery
According to the recent research of Ecorio, group 29 batteries are high-performance batteries and are commonly found in large medical and security systems, vehicles, and industrial applications, etc. Furthermore, these are commonly used in deep cycle or standby applications.
These 12-volt group 29 deep batteries are quite heavy and large in size. These will weigh around 55 lbs. to 61 lbs. The group 29 deep cycle typical offers a capacity of 65-120 Ah.
The reverse capacity of group 29 offers 120-210 minutes. These batteries are reasonable and fit perfectly with your vehicle. But compared with group 31 the performance with quite low.
Group 31 Battery
The group 31 battery generates higher levels of energy. This helps to turn the motor to propel the vessel on its course. 31 batteries are larger in size and also very durable. Besides, it derives capacity from the lead-acid chemical formulation.
This one is a very strong and powerful product. These batteries are commonly found in vehicles, industrial applications, marine applications, and powering Instruments, etc.
These 12-volt group 31 batteries are large and heavy. But the performance level is amazing. The of this group battery is around 30 lbs. to 80 lbs.
Group 31 typically offers a capacity of 75-125 Ah. The reverse capacity of group 31 is 150-250 minutes. Group 27 provides 750-1250 CCA and the performance is higher than group 29 deep cycle.
1. Which battery will last long group 29 or group 31?
These are designed to be discharged down as much as 80% time after time. But group 31 last for long at it has better function and features. Moreover, RC is higher than group 29.
2. Which group battery is best a group 29 deep cycle or a group 31 deep cycle?
Depending on the features and performance a group 31 deep cycle is better than a group 29 deep cycle. Group 31 has a better capacity, CCA, and RC.
I hope you have got the overview of battery group 29 vs group 31 battery. These two batteries are completely different even the look and design are quite different. Group 31 is larger and the performance level is high than group 27.
So, you can take group 31 for better performance. If you are willing to swap your batteries always try to get the best one. However, you have to play a little bit more but you will get the best performance.
I hope I have covered the most important parts when it comes to the difference and the swapping between the group 29 vs group 31 batteries. So, follow this guide before changing your car battery.