You might think shopping for a new car battery is as straightforward as replacing it with one that appears identical, but there’s a bit more to it.
There are numerous types of car batteries that all come in different sizes.
Are you perplexed yet?
Don’t worry; we have got you covered.
If you’re asking yourself: “what size battery do I need?” then you have come to the correct place.
For a battery to fit, it must be the correct size. Thankfully, group sizes make finding the appropriate one easy.
You must also select a battery type – wet cell or VRLA. The former contains liquid electrolytes and may require minor maintenance. The latter has no liquid and is maintenance-free.
Ready to dive into the exciting world of battery types and group sizes?
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Wet Cell Or VRLA – Which Car Battery Type Should You Choose?
Wet Cell Car Batteries
It’s your choice whether you say “wet cell” or “flooded.” Still, these are the initial lead-acid batteries made specifically for cars.
What is the justification for that?
Due to their sturdy and economical nature, wet cell batteries can last for a considerable period when well taken care of. By “taking care,” we mean addressing the sole disadvantage of such batteries, which is the need for regular inspection every few weeks.
What you want to check is the water level, which a wet cell battery uses to produce power. As the charge cycles, it loses water, meaning you’ll have to add distilled water about once per standard cycle.
Thankfully, this is as straightforward as removing a cap and adding a small amount of distilled water.
However, sealed wet cell batteries do not require attention, and these are known as “semi-solid.”
There are two classifications of wet cell batteries to choose between, which is SLI and deep cycle.
SLI stands for Starting, Lighting, and Ignition, and as you might have guessed, this is what they’re in charge of. These deliver a brief burst of power to get the vehicle started. They also power the lights and ignition. After that, it’s up to the alternator to keep things running.
The second variation is a deep cycle (also called a marine battery).
Where a damp cell is made to deliver short bursts of power, where they never run low, deep cycle batteries supply long-term power and can be recharged many times even after depletion of up to 80%.
VRLA Car Batteries
The second car battery type is a VRLA (Valve Regulated Lead-Acid). These are closed batteries, meaning no gases or fluids can get in, and none can escape.
The durability of a VRLA car battery is also its weakness. Since it’s sealed, it does not require any maintenance, but this also means it can’t be worked on. Meaning, if there’s a problem with it, replacement is the only option.
VRLA car batteries also don’t contain any liquid electrolytes; they favor alternative means, such as gel or AGM.
VRLA batteries with gel electrolytes are incredibly resilient. They can withstand impacts, shocks, high temperatures, and vibrations.
AGM VRLA batteries work similarly to those with gel, but the electrolytes are kept in glass mats instead. These are made of slender fibers meshed together. This creates a dehydrated substance that holds the electrolytes and prevents them from spilling.
Which automobile battery type is right for you?
Well, this is where group sizes come into play. Your vehicle was designed with a specific battery in mind, which is described in your owner’s manual.
Sticking with the suggested battery negates having to worry about things like the cold cranking amps (CCA) and reserve capacity (RC).
Let us now go over the numerous battery group sizes in detail.
Car Battery Group Sizes Explained
The group size indicates several things. These encompass the length, width, and height of the battery, as well as the location of each terminal. Whichever group it falls in, it will also be unique to the year, make, and model of the car.
The sizing is based on an industry benchmark. This makes it easier for automakers to design their engine compartments around.
Thankfully, rather than having to pull out a tape measure to determine which group size your battery falls in, it’s displayed right on the unit itself.
A pair of the most common include these:
- 24
- 24F
- 25
- 34
- 35
- 51
- 51R
- 52
- 58R
- 59
- 65
Many automobile brands tend to favor specific groups, like General Motors. GM often uses side-post batteries, which carry group numbers like 70, 74, 75, and 78.
This shows that the group number specifies not just the size, but the arrangement of the battery as well. Some of these include side-post, recessed tops, and American standards.
The design is essential to consider because, with some of them, like a recessed top battery, the posts do not protrude as they do on an American standard. The same goes for a side-post, which houses the posts on the side rather than the top.
Thanks to the battery group sizing system, it’s as straightforward as looking at the unit for the group number and replacing it with one that matches. However, you should always look in the owner manual, just in case someone installed the incorrect one previously by mistake.
What Happens If You Install The Wrong-Sized Battery?
If you install the improper size battery, then you obviously never read through this article.
However, if you did happen to purchase the incorrect size, it’s likely that it won’t fit properly in place. If it does fit, that doesn’t mean you’re out of the woods.
Using an American standard as an example. If you employ one in a vehicle built for a recessed top, the ports may end up being too close to the hood of the car. This can create a spark, cause an electrical short, or even lead to a hazardous fire.
Why take the risk in the first place? Instead, take the time to consult your owner’s manual and determine which battery size group your vehicle was designed for.
