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Best Car Batteries: A Guide to Buying a Car Battery in New Zealand

Buy a reliable battery that goes the distance; our definitive guide explains everything you need to know
Updated 8 August 2024
​Few car components are as important as the car battery. Just take a moment to think about it. A dead battery will leave you no choice but to ask for roadside assistance. So as simple and inconspicuous as it may seem, your car battery deserves some attention. 

In this guide, we will help you understand the basic concepts you need to know to buy the best battery in New Zealand and thus avoid unnecessary headaches.
Our Car Battery Buying Guide Covers:​

Types of Car Battery

When it comes to car batteries, you will find several classifications. You can categorize batteries depending on their intended purpose, the technology they use, their size, and so on. It is overwhelming, we know. But considering car batteries have been around for more than 130 years, that should no surprise either. For the purpose of this guide, we will classify them according to their technology, since in our opinion that will give you the necessary knowledge to distinguish one type from another when you go shopping car batteries. 
  1. Wet Cell Batteries, also known as Flooded Batteries
    1. Lead-Acid Batteries, also known as Starting, Lighting and Ignition Batteries (SLI)
    2. Enhanced Flooded Batteries (EFB)
  2. Dry Cell Batteries, also known as Valve-Regulated Lead-Acid (VRLA) Batteries
    1. Absorption Glass Mat (AGM) Batteries
    2. Gel Cell Batteries

Lead-Acid Batteries (SLI)

Lead-acid batteries, also known as SLI due to its purpose of providing power to Starting, Lighting and Ignition systems, are the most common type of battery. Internally, they consist of several positive and negative plates and a liquid solution called electrolyte that usually contains lead, sulfuric acid and water. What set this type of battery apart from the rest is their low manufacturing cost, and their ability to deliver short, quick bursts of energy.

Due to its working principle, this type of battery is better suited for old-style cars, that does not have too many electric accessories. It is important to notice that you can find in stores a special type of SLI battery called calcium battery, which is a lead-acid battery with no antimony in its grids. Calcium batteries offer better resistance to vibration, heat, and generally speaking offer better power output than their antimony based counterparts.
 
Lead-Acid Batteries Highlights 
  • They are the most common type of battery.
  • They are cheap.
  • SLI batteries are good for “standard” vehicles that do not require continuous power from the battery, but quick bursts such as those needed during engine start.
 
Lead-Acid Batteries - What We Like:
  • Economic. The technology behind modern SLI batteries has been around for more than 50 years. That makes these batteries cheap to manufacture and hence they are the most affordable type of battery you can find
  • Widely available. Since this type of battery is (still) the standard in many applications, you can purchase it almost everywhere. This is an advantage in case you have an emergency far from home and need a battery to get your car running.
  • Come in different sizes and capacities. It is almost certain that you can find an SLI car battery in any size, post configuration, and capacity you may need. Bear this in mind, since if you have a restoration project, or a custom application, this type of battery might be ideal to get the most out of your available space.
 
Lead-Acid Batteries - What We Dislike: 
  • Require maintenance. Depending on their manufacturing process, some SLI batteries might require periodic maintenance that consists of completing the electrolyte solution in case of need.
  • Leak prone. Since these types of batteries are flooded with acid, they can only be used in the position indicated by the manufacturer. They cannot be flipped or tipped as this would almost immediately lead to an acid spill.
  • Not compatible with newer cars. This type of battery does not meet the specifications required by newer cars. In other words, most SLI batteries are focused on vehicles and applications from 5 years ago.

Enhanced Flooded Batteries (EFB)

As their name implies, Enhanced Flooded Batteries (EFB) are optimized versions of the SLI batteries. This type of battery features additional insulation material between the inner plates, giving them an extended life cycle and more than double the partial and deep discharge performance compared to conventional batteries.

​Due to these enhancements, EFB batteries are often used as replacements for conventional SLI batteries. Some Deep Cycle Batteries use this technology since is relatively cheap and provide a decent number of charging cycles. The performance of EFB batteries also made them perfect for entry-level start-stop systems included in some newer cars.
 
Enhanced Flooded Batteries Highlights 
  • Offer about 2x times the partial and deep discharge performance of SLI batteries
  • They are still relatively cheap in comparison with other modern batteries
  • Can be used in various car applications, including recent vehicles using entry-level start-stop systems
 
Enhanced Flooded Batteries, What We Like 
  • Affordable. Although EFB batteries are more expensive than conventional SLI batteries, they are still way more affordable than other technologies used in newer cars.
  • Better value than SLI batteries. Their increased performance and relatively reasonable price make EFB batteries a good option for many applications that consume more power from the battery.
  • Come in different sizes and capacities. Similar to SLI batteries, EFB batteries are available in many sizes and capacities.
 
Enhanced Flooded Batteries, What We Dislike 
  • May require maintenance. While most EFB batteries are “maintenance-free” we strongly suggest double-checking this aspect before purchasing the battery.
  • Not compatible with high-performance applications. Although EFB batteries perform noticeably better than their SLI siblings, they still lack the required level of deep discharge performance and capacity of newer Gel and AGM batteries used in much newer cars.

Absorption Glass Mat (AGM) Batteries

AGM batteries have many advantages in comparison to “wet cell batteries”. First of all, since their electrolyte is bound to a special glass fibre separator they can be positioned in any direction without risk of leakage. Secondly, AGM batteries have a higher output which makes them perfect for more recent cars that have all kind of electric accessories, computers, and modules. In addition to these benefits, can withstand up to three times more charging cycles than a conventional SLI battery. 
 
Absorption Glass Mat (AGM) Batteries Highlights 
  • AGM batteries offer higher output than EFB and SLI batteries.
  • They ideal for cars with high power demands (such as automatic start-stop systems).
  • Due to its construction, AGM batteries are maintenance-free.
 
Absorption Glass Mat (AGM) Batteries, What We Like 
  • Highest power output. AGM batteries can be used in almost all type of vehicles, regardless of the number of accessories, electronic systems or total power consumption. They offer the highest specific power of any other type of battery.
  • Great flexibility. AGM batteries can be positioned vertically, horizontally, or diagonally, without any risk of leaks. Depending on your application this can be a huge benefit. For example, in custom off-road applications you can position the battery (or batteries) attached to the sides of the trunk compartment if you need to.
  • Excellent partial and deep discharge performance. Due to its design, AGM batteries are exceptional for off-road, and RVs applications that require a reliable power source to feed lighting systems, sound systems, infotainment systems, and more.
  • Vibration resistance. AGM batteries are not affected by vibration, making them perfect for demanding off-road applications.
 
Absorption Glass Mat (AGM) Batteries, What We Dislike 
  • Expensive. With the exception of Lithion-Ion batteries, this is the most expensive battery type of all.
  • Sensitive to heat. One big disadvantage of AGM batteries is their low resistance to heat. For this reason, most manufacturers locate AGM batteries outside the engine compartment, usually in the trunk or bellow passenger seats.
  • Deep discharge. Although AGM batteries offer better resistance to deep discharging than EFB and SLI batteries, they still fall behind Gel batteries.
  • Cycle life. Arguably one of the most significant drawbacks of AGM batteries had to do with their expected lifecycle. They last more than EFB batteries by several orders of magnitude, however, Gel batteries typical outperform them by a factor of two.

Gel Cell Batteries

Gel cell batteries are a special type of VRLA battery that basically differs from their AGM cousins in the material used for the electrolyte. In the case of Gel batteries, they use a silica-based electrolyte instead of fibreglass. This alone provides significant improvements in areas as average life expectancy, resistance to deep discharging, risk of thermal runaway, and cost. Due to their nature, this type of batteries is used for deep-cycle applications such as marine applications, small electric vehicles, off-road applications (ATVs), and more.
 
Gel Cell Batteries Highlights 
  • They are expensive but more affordable than AGM batteries
  • Perfect for deep-cycle applications
  • They have an incredible life expectancy
 
Gel Cell Batteries, What We Like 
  • Deep-cycle ready. Depending on your application, replacing your actual battery with a gel battery might be an excellent idea. For instance, if you love exploring remote places in New Zealand you might want to have a deep-cycle battery to power your lights and accessories during the night knowing that you will not harm batteries internals doing so.
  • Reliable. Gel batteries are among the most reliable type of battery you can purchase. They share most features of AGM batteries and then enhance some of them even further.
  • Faster charge. Gel batteries can be charged up to 5 times faster than conventional batteries using lead-acid technology.
 
Gel Cell Batteries, What We Dislike 
  • Expensive. While gel batteries might cost you less than AGM batteries they are still quite expensive when compared with SLI type
  • Heat sensitive. Although they can withstand heat better than AGM batteries, it is recommended to keep them in areas where temperatures do not exceed 49°C.

Key Factors to Consider When Buying a Car Battery in New Zealand

Buying a car battery in New Zealand is easy once you know what to look for. Below is a quick cheat sheet with the key factors you should have in mind when choosing a battery for your car or SUV:
  1. Battery type. This has to do with the technology in which is based on the battery. Lead-acid, calcium, AGM, Gel, etc.
  2. Intended usage. Depending on your application you may obtain better results with one particular type of battery. For instance, ATVs might benefit more from AGM or Gel batteries than SLI or EFB batteries.
  3. Battery size. Batteries are classified into group sizes which indicate the length, width, and height of the battery. You can easily find the battery group by looking at your current battery, or by consulting your owner’s manual. It is recommended to use the same size as the OEM battery. However, some cars, SUVs, and off-road applications allow you to use bigger batteries which translates is higher reserve capacity.
  4. Reserve capacity. Simply put, the reserve capacity is the amount of time the battery can run on its own charge without the aid of the alternator before discharging. Good reserve capacity is important as it can help you in situations like leaving your car lights on or alternator failure. 
  5. Type of terminals. Different vehicles may use different types of battery terminals, different terminal positions, and even different terminal polarity. This is one of the most important factors to consider (especially polarity) since you will not be able to install the battery if the type and position of the terminals are not the same as the old battery.
  6. Cold Cranking Amps (CCA). Cold Cranking Amp (CCA) is a measure that points to the ability of the battery to start a car at 0 degrees Fahrenheit. The higher the CCA the higher the output of the battery.
  7. Maintenance. This aspect refers to the level of maintenance required by the battery. In that regard, maintenance-free batteries (aka sealed batteries) are a better option than standard batteries.
  8. Price. Conventional lead-acid batteries usually cost less than AGM batteries, however, AGM batteries can last up to 3 times more. So, in cases where you can choose between one type or another, you will have to consider the short-term and long-term benefits of each battery type.

Four of the Best Car Batteries Available in New Zealand Right Now

​Choosing the best car battery currently available in New Zealand is not an easy task. We have compiled our list (in no particular order) based on average consumer reviews collected from consumer.org.nz as well as other sources both in New Zealand and overseas.

1. Best Lead-Acid Battery

Century DIN65ZLMF - ULTRA Hi PERFORMANCE
​What We Like
​What We Dislike
  • Affordable
  • Good for daily usage
  • Excellent warranty
  • Lead-acid SLI type
  • Heavy
​The Century DIN65ZLMF Ultra Hi-Performance battery is without any doubt an excellent choice as replacement of the factory equipped battery. This is basically the same OEM factory but at a discounted price. Century’s Hi-Performance line consists of premium batteries with ultra-high quality materials prepared for New Zealand’s climate. Although the DIN65ZLMF is adequate under normal driving conditions, it has all the limitations associated with a “standard” lead-acid battery.
 
Century DIN65ZLMF - ULTRA Hi PERFORMANCE Key Features: 
  • Recommended for: daily usage, stock battery replacement
  • Battery type: Lead-acid
  • Battery size:  277mm (L) x 175mm (W) x 175mm (H) x 175mm (TH)
  • Reserve Capacity: 63AH
  • Type of terminals: standard post
  • Cold Cranking Amps (CCA): 690CCA
  • Maintenance: maintenance-free
  • Warranty: 36 months
  • Weight: 15.5Kg

2. Best EFB Battery

Century DIN65LMF ISS Active EFB
​What We Like
​What We Dislike
  • Compatible with ISS vehicles
  • EFB technology
  • Slightly higher reserve capacity
  • Expensive
  • Heavier than the stock battery
  • Not as reliable as AGM or Gel batteries
​If you are looking for the benefits of EFB batteries then the Century DIN65LMF ISS Active EFB - ULTRA Hi PERFORMANCE is for you. Although EFB batteries are not as reliable as AGM or Gel batteries, they last longer than standard batteries, offer better partial and deep discharge performance and slightly better reserve capacity. With that said, our suggestion is to compare the price of EFB batteries compatible with your vehicle and the price of a good AGM battery. If the price of both is similar, we suggest you opt for the AGM battery as it offers more benefits than its EFB counterparts.
 
Century DIN65LMF ISS Active EFB - ULTRA Hi PERFORMANCE Key Features: 
  • Recommended for: daily usage
  • Battery type: Enhanced flooded battery (EFB)
  • Battery size:  277mm (L) x 175mm (W) x 175mm (H) x 175mm (TH)
  • Reserve Capacity: 65AH
  • Type of terminals: standard post
  • Cold Cranking Amps (CCA): 650CCA
  • Maintenance: maintenance-free
  • Warranty: 24 months
  • Weight: 17Kg

3. Best Calcium Battery

Century NS70LMF Ultra Performance Calcium
​What We Like
​What We Dislike
  • Good off-road performance
  • Calcium technology
  • Huge reserve capacity
  • Heavier than the stock battery
  • Not as reliable as AGM or Gel batteries
​Without any doubts, batteries using calcium-based technology as the Century NS70LMF Ultra Performance offer good value. They don't cost you a fortune and still provide you with a noticeable improvement over the factory battery. Aside from the huge improvement in battery’s reserve capacity, its calcium technology allows you to use this battery in demanding off-road trails without worrying about heat or vibration. Hands down, a good choice for New Zealanders that love adventure.
 
Century NS70LMF Ultra Performance Calcium Key Features: 
  • Recommended for: daily usage, off-road
  • Battery type: Calcium Technology Lead-Acid
  • Battery size:  260mm (L) x 174mm (W) x 202mm (H) x 225mm (TH)
  • Reserve Capacity: 80AH
  • Type of terminals: standard post
  • Cold Cranking Amps (CCA): 685CCA
  • Maintenance: maintenance-free
  • Warranty: 24 months
  • Weight: 18.2Kg

4. Best AGM Battery

Century DIN66LAGM ISS Active AGM
​What We Like
​What We Dislike
  • Compatible with ISS vehicles
  • AGM technology provides superior starting power
  • 3x higher cycling performance
  • Deep discharge capabilities
  • Expensive
  • Heaviest of the list
​AGM batteries such as the Century DIN66LAGM ISS Active offer the highest level of performance possible. Not only you get above-average reserve capacity, but also incredible CCA output. Moreover, since AGM batteries have great deep discharge capabilities, you can use this battery with confidence to power LED lights bars, LED pods, sound systems, and more. Although it is true that AGM batteries are the most expensive, it is also true that they offer a long lifespan and benefits that no other type of battery can give you.
 
Century DIN66LAGM ISS Active AGM Key Features: 
  • Recommended for: daily usage, off-road, performance applications
  • Battery type: Absorption Glass Mat (AGM)
  • Battery size: 278mm (L) x 175mm (W) x 190mm (H) x 190mm (TH)
  • Reserve Capacity: 70AH
  • Type of terminals: standard post
  • Cold Cranking Amps (CCA): 760CCA
  • Maintenance: maintenance-free
  • Warranty: 24 months
  • Weight: 20.60Kg
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