Giant Power 100AH 12V AGM Deep Cycle Battery

SKU: DC-12V-100AHX
On sale! 43% off, save $200
$269.00 $469.00
Preorder Stock
ETA for new stock: 9-8-2024
Available Options

Buy now, pay later

Interest free instalments

Four equal payments of $67.25/fortnight, with instant approval online. Learn more


High Capacity and Performance


Power your applications with confidence using our 100AH Absorbent Glass Mat (AGM) Battery. Known for its exceptional reliability and performance, this AGM battery is designed for a wide range of uses, its maintenance-free design and deep cycle capabilities make it a dependable choice for both everyday and emergency power needs.

This 100Ah lithium deep cycle battery is a powerful and efficient energy storage device. It is specifically designed to provide a consistent and long-lasting source of 12V power for your adventures. 

100AH AGM Battery

Deep Cycle Batteries Australia Giant Power 100AH AGM batteries are designed for a more efficient discharge recovery. Faster recharging technology and battery protection deliver reliable performance. The sealed structure, copper alloy terminals and factory sealed lid allow no leakage of any caustic chemicals, and ABS intrusion-safe body and heavy-duty posts ensure reliable performance against any drastic vibrations shocks or outer wreckage. This maintenance-free battery features longer shelf-life and excellent water retention performance.


Watch Our Videos to Learn More

A decade of FIVE STAR Customer Reviews showcase the quality of the GIANT POWER AGM 100AH BATTERY this is a best selling Aussie battery.

Best AGM Battery Australia Adventure Awaits with Reliable Australian Owned & Operated Giant AGM Battery Power!

Nobody wants food going off because they didn't get enough battery power to run their fridge or 12V caravan & camping setup properly! Don't let a flat battery ruin your trip! Use a trusted Aussie best selling AGM battery!


  • Running appliances when camping away
  • Perfect for powering your 12V fridges, high powered inverters & 12V lights
  • Excellent for use with a solar panel 
  • Perfect for running in a dual battery system 
  • Superb for use in 4x4 and marine conditions
  • Designed Service Life 12 years.
  • Ideal for frequent cyclic discharge
  • Exceptional deep discharge recovery 
  • Low self-discharge characteristics
  • We suggest adding a battery heat shield for best results.

100AH Lithium Deep Cycle Battery

**This battery will work with trolling motors. However, if you allow heat, fluids and other contaminants to damage the battery, unfortunately, it will void your warranty. 

Why the Giant Power 100AH AGM is a Best-Selling Deep Cycle Battery in Australia


Giant Power 100AH Deep Cycle Batteries will remove your worry by guaranteeing that you have a reliable battery power source. Let's look at the range of benefits to using a 100AH AGM Deep Cycle Battery to power your camping, caravan, boating and 4WD adventures. We talk to so many disappointed customers about their experiences with inferior products generally bought on eBay. The benefit of buying a Giant Power 100AH AGM Deep Cycle Battery is reflected in the solid 5 Star customer reviews we receive for this battery. Giant Power are dedicated to making sure that your AGM battery provides you with exceptional power and performance.


100AH GIANT AGM Deep Cycle Batteries are ideal ancillary batteries to fit into your caravan, 4x4 vehicle, camper-van, RV or other camping setup. The Giant Power range of AGM Deep Cycle Batteries have outstanding deep discharge recovery with high oxygen-recombination efficiency that ensures no loss of electrolytes, giving these batteries exceptional deep discharge recovery performance just in case you accidentally discharge your batteries a little too much! This also guarantees you will never need to replace electrolytes during the course of the batteries life.


Because of the rugged environments where Giant Power 100AH AGM batteries are used around Australia Aussie Batteries work closely with our customers to ensure our battery products are geared to meet your exact needs.


This battery is one of our bestsellers because owning a 100AH Deep Cycle Battery means that you can control and store solar energy for power. If you have a solar panel system you can use these batteries to store power and then use this energy to run a range of items. The reliability of 100AH Giant Deep Cycle AGM battery storage also means that you can use the power when you have bad weather or little sunshine. Having a battery backup essentially means you have a lot more control of how you use the power that your camping solar or 12 Volt setup is producing.


Giant Power Batteries are built tough, and they are designed with more lead to create stronger connections between cells and heavier plates to increase the batteries reserve capacity. Giant Power Batteries are built to maximise life cycles, so you get reliable power every time!


This 100AH GIANT POWER DEEP CYCLE BATTERY will give users reliable and easy battery power to run items like camping fridge's, 12V lights, phones, devices and other 12V / 24V camping accessories! Giant Power Batteries allow customers to focus on enjoying the great outdoors and are the perfect battery for camping because of their high quality construction and superior Reserve Capacity (RC) or Ampere Hour (AH) rating that will exceed your requirements.

The "100Ah" refers to the battery amp-hour rating, which measures the capacity or energy storage capability of the battery.

  • Industry Leading 5 Year Warranty
  • Perfect for most 12 Volt Setups 
  • 12 Year Designed Service Life
  • Compatible with most Battery Boxes
  • Bolt Terminal Connections
  • Australian Owned and Operated Company

With a GIANT POWER 100AH AGM BATTERY, you get massive battery capacity. Unlike some of our competitor's batteries who recommend only using 30-50% of the battery capacity with Giant Power, you get more value from your AGM Batteries. When your camping and running a 12v fridge, most battery manufactures will recommend running the battery down to 50%, which is normally about two days of autonomy. With Giant Power Batteries, you get double the power usage due to the thicker lead plates and quality construction this means you get up to four days power autonomy.

The Advantages of AGM batteries:

For powering long distance journeys on recreational vehicles, choose deep cycle AGM batteries for a hassle-free experience. Deep cycle AGM batteries can repeatedly discharge to approximately 80% and recharge without losing capacity to deliver high power in a short amount of time. They are also resistant to vibration making them suitable for all kinds of terrains in Australia.

1. AGM Batteries deliver a higher output

AGM batteries have a lower internal resistance than any other lead acid battery. This enables AGM batteries to provide high bursts of power when required such as starting an engine or providing emergency or backup power.  AGM’s also have high charge acceptance.

2. AGM Batteries are spillproof

AGM batteries do not have any free electrolyte in the cell as is it suspended in the glass mats. Placing the battery upside down is not not recommended.

3. AGM Batteries are durable

AGM batteries are designed to be sturdy, handling vibration particularly well. The plate groups are compressed into each cell; this compression holds everything together.. They are also resistant to a condition known as acid stratification, where the acid and water separate over time.

4. AGM Batteries are resistant to vibration

The electrolyte soaked glass mats in between each lead plate act like a damper. The plates are compressed between the mats making AGM batteries highly resistant to vibration. This makes them suitable for vehicles that operate in high vibration conditions (i.e. ATVs, 4WDs & SUVs).

Charging Your AGM Battery

We Suggest The PROJECTA PRO-CHARGE RANGE simply connect the battery with the clamps or fixed eyelet harness and plug the charger into a wall for fast and efficient charging.

AGM batteries are very sensitive to overcharge and over-discharge, improper charging and discharging will lead to the reduction of battery life. So the proper charging process is very important. An AGM battery can last years in your car, boat or RV, and keeping it charged with the right battery charger is the best way to make sure you get the most life from it. On regular basis at 25°C for 12V deep cycle AGM batteries, float charge voltage is 13.5V~13.8V, cycle charging voltage is 14.4V~15.0V. 

DC-DC Charging For AGM Batteries

Why not look at a DC to DC charger that is suitable for LiFePO4 and lead acid: AGM, Gel & Calcium Batteries, and allows you to re-select the battery during charging. With the memory function of this battery to battery charger, you don't need to re-select the same battery type every time.

 ** This 100Ah Giant Power Battery is ideal for up to a 1000W inverter. If you exceed this limit, it could damage the battery internally. 


140Ah Lithium Deep Cycle Battery

140Ah Lithium Battery Kit including battery box and battery charger

Australian Made Lithium Batteries

We're Here to Help!

For Expert Advice — CONTACT US



If you need reliable battery power GIANT POWER 12V AGM Deep Cycle Batteries are purpose-built specifically for long-use applications. This AGM is a heavy duty battery with a thick plate design and advanced AGM separators. Giant is a true deep cycle battery designed for frequent discharging while providing high capacity and long battery cycle life.


Maintenance Free operation this means no more refilling cells with water simply purchase and reap the benefits of a high quality AGM Battery.


High Vibration Resistance means our batteries can withstand the toughest 4x4 and high vibration conditions.


Non-Spillable and Non-Gassing with an in-built safety valve to keep you and your family safe by ensuring your battery is fully sealed and preventing any possible battery explosions.


Durable AGM Plates: High purity, thick lead-calcium alloy plates ensure a long design lifespan of 12 years (for infrequent discharge @20°C).


Lead-calcium grids maintain a low self-discharge rate of approximately 3% of capacity per month.


Quality Copper-Silver Terminals means small contact resistance and high corrosion resistance.


Giant Power 100AH AGM Deep Cycle Batteries are a premium quality battery that is designed to deliver industry-leading reserve capacities and life-cycle capabilities. Many innovative technologies, including a high AH ability and heavy duty ABS (heat resistant) rated case, make Giant Power Batteries the perfect solution for the challenging operating conditions of energy storage and other off-grid applications around Australia. The ideal combination of premium quality materials has catapulted Giant Power Batteries to becoming an Australian industry leader rated for both value and customer satisfaction.

All Giant Power deep cycle batteries are backed with an industry leading 5-year warranty and have a 5-star status among Australian users because they can take a hell of a beating, both physically and power-wise.

AGM Batteries use glass mat technology within the battery to absorb the acid, as opposed to standard flooded batteries where the acid is free flowing. This provides several key advantages over standard batteries, they are also 100% sealed, non-gassing and maintenance free (this means your batteries will never leak acid, even if damaged), and they will provide a significantly longer service and cyclic life (up to 2-3x longer than standard batteries). If you want to run a remote power system, you'll need the right Deep Cycle Battery to keep the current flowing. If you need reliable energy GIANT POWER 12V Deep Cycle Batteries are purpose-built specifically for these long-use applications.

*Please note installing this battery under your car bonnet as a starting battery or in electric golf buggies, mobility scooters may void your warranty. More suitable battery types for these applications are CCA-Rated.

Giant Power 12V 100AH AGM Deep Cycle Battery

AGM Batteries are Perfect for Use in a Range of 12V Power Applications

AGM batteries can resist damage from extreme temps and vibration. The absorbed mats give AGM batteries a sponge-like resistance to vibrations. A regular car battery's sensitive internal components can break apart if you shake it hard enough. Its lead plates are hanging from a sturdy metal in liquid. In the battery industry, there are two ways that AGM batteries are rated:


While battery cycle life is about how many times your AGM battery will discharge before dropping to under 80% of original capacity the service life is directly related to how many years the battery chemistry will last until it is less than 80% capacity from the original state. The Giant Power 100AH Deep Cycle is made with exceptional quality giving an industry-leading 12 year rated service life. This 100AH Giant Power Deep Cycle Battery will give users the best battery power required to run items like camping fridge's, 12V lights, and other 12V / 24V camping and caravan accessories!

Giant Power Batteries use Tier 1 corrosion resistant lead calcium internal plates and quality copper terminals.

Giant Power batteries will give users 2-3 times longer service life than other AGM Batteries (particularly substandard eBay batteries).

Key Features

  • High Capacity: With a robust 100AH capacity, this battery provides long-lasting power for demanding applications, ensuring extended usage periods without frequent recharging.
  • AGM Technology: The Absorbent Glass Mat technology ensures efficient charge and discharge cycles, reduced internal resistance, and enhanced overall performance.
  • Slimline Design: The slim profile of the battery makes it perfect for installations where space is limited, providing flexibility without compromising on power.
  • Front Terminal Access: The front terminal configuration allows for easy and quick installation, maintenance, and connection, improving user convenience and safety.
  • Maintenance-Free: Designed to be completely maintenance-free, this AGM battery requires no water topping or regular upkeep, reducing the total cost of ownership.
  • Durable Construction: Built with high-quality materials and a sturdy casing, the battery is designed to withstand harsh environments and heavy use, ensuring long-term durability.
  • Versatile Applications: Ideal for use in telecommunications, renewable energy systems, backup power supplies, UPS systems, and other critical applications that require reliable and uninterrupted power.

AGM batteries can resist damage from extreme temps and vibration.

The absorbed mats give AGM batteries a sponge-like resistance to vibrations. A regular car battery’s sensitive internal components can break apart if you shake it hard enough. Its lead plates are hanging from a sturdy metal in liquid. Even if you don’t break the plastic case, it’s common for car batteries to die if you rattle them hard enough. an AGM battery’s fiberglass mesh keeps that water trapped because it’s packed so tightly to the lead plates. On top of that, the sealed design holds the water vapor in, and only if you overcharge it will a molecules of water vapor escape. An AGM battery’s sealed, spillproof design allows them to pass the specific transportation regulations. You can ship them by air, deliver them by mail, etc. It might be odd to think of spilling a car battery, but you should understand that standard car batteries are not as durable as AGM batteries. They’re more like a full cup of water with a sippy cup lid. If you turn it over, it spills or leaks. AGM batteries are more like sealed soda cans. You can transport them, and they won’t spill or leak if turned on their side. 

AGM batteries have special valves that protect their service lifespans.

AGM batteries also have valves regulating the hydrogen and oxygen allowed to escape during charging. They fall under a broader category of valve-regulated, lead-acid (VRLA) batteries, also called maintenance free. If you’ve never thought much about maintaining your car battery, it might be thanks to this special one-way valve that essentially keeps evaporated water from leaving the battery case. The battery’s fundamental chemistry is still based on lead, sulfuric acid and water. When you draw power, the acid molecules move to the lead plates, leaving water and lead sulfate — and sending an electrical charge out of the positive post. Removing the sulfuric acid from the solution creates a chemical reaction between the paste on the plates. Recharging a battery works in reverse: Electricity goes in, making the liquid more acidic.

AGM batteries recharge faster than regular batteries.

Fiberglass mesh mats soaked in electrolyte carry current faster than liquid electrolyte. Yes, that’s how AGM batteries can deliver big bursts of power even if they’re drained. It’s also how AGM batteries recharge faster than regular batteries. That low internal resistance means AGM batteries can give more amps and accept more amps when they recharge.

Standard batteries need more voltage than AGM batteries to recharge because regular batteries have higher internal resistance. To keep them from overheating, they can only take a few amps at a time at that high voltage.

This means AGM batteries need a special AGM charger. They can take a lot of amps in a short period of time — but an AGM battery charger must keep its voltage lower than 14 volts to avoid ruining the AGM battery. AGM batteries are 12 volts, like all car batteries, and can handle some higher voltage, but only up to a certain point. If a car alternator charges an AGM battery with a voltage higher than 15 volts, it can damage an AGM. 

Highest Quality Engineering

AGM batteries are a kind of valve-regulated, lead-acid (VRLA) battery, which is part of why AGM batteries last so long. VRLA batteries have a one-way valve regulating how much hydrogen and oxygen can escape when the battery recharges. Normally, when a standard battery recharges, electricity splits the water in the electrolyte into hydrogen and oxygen, which mostly gets absorbed back into the electrolyte. The rest of the hydrogen and oxygen escapes through vents in the case, and the battery loses water. Water loss can kill a car battery, and that’s why you should occasionally refill your standard batteries with distilled water. You don’t have to maintain VRLA batteries the same way. Their one-way valves keep the gases in the battery, effectively preventing water loss.

100Ah AGM batteries can outperform a regular car battery in almost every way because of their design. A low internal resistance means AGM batteries can give more amps and accept more amps when they recharge. 

Benefit From Proven Performance

AGM batteries hold their charge well and are less likely to sulfate when compared to regular wet cell batteries (conventional batteries types). Because of this, they are an excellent choice for vehicles that require off-season storage. AGM batteries can be mounted in more flexible orientations than conventional batteries because the liquid is sealed inside the battery. Because the liquid electrolyte flows freely inside conventional batteries, they must be mounted and stored upright to prevent leakage. Another advantage of the electrolyte being absorbed and held by a separator suspended inside the battery is that it is more resistant to vibration, a vital plus for 4WDs or other vehicles that operate on uneven surfaces.

Australian Owned and Operated 

100AH Lithium Deep Cycle Battery Online Designed for Off Road and Heavy Duty Applications

Perfect for use in caravans, marine, camping and home storage off grid applications. Solar, wind or battery charger compatible. Designed to handle the vibration when off road.

100AH Lithium Deep Cycle Battery Online Run in Parallel or Series 

Run Giant AGM deep cycle batteries in parallel or series and boost the time they can run for before needing a recharge.

100AH Lithium Deep Cycle Battery Online Portable Power Solutions

Giant batteries are lightweight, when compared to many other options, and have built in carry straps, which make moving around the campsite easy.

100AH Lithium Deep Cycle Battery Online Quality Copper-Silver Terminals

Quality Copper-Silver Terminals means small contact resistance and high corrosion resistance.

140Ah AGM Battery Sale

While both AGM and Lithium batteries provide reliable power, here are some notable differences that set them apart:

  • AGM batteries are more affordable than Lithium batteries.
  • AGM batteries have a shorter cycle life compared to Lithium.
  • AGM batteries can only be discharged to 80% Depth of Discharge (DoD) while Lithium Iron Phosphate batteries can be discharged to 100% DoD in an emergency.
  • Lithium batteries are approx. 50% lighter in weight compared to AGM batteries.
  • Lithium batteries have an active Battery Management System (BMS) which will shut down the battery to protect it if the temperature, voltage or current is outside the nominated range.

When it comes to deciding between an AGM Battery and a Lithium Battery, the application, intended use, expected life expectancy and budget play a major role - both Lithium and AGM are excellent deep cycle battery choices as they deliver excellent performance and efficiency at a competitive price.

Australian Made AGM Deep Cycle Battery Giant Power

We're Here to Help!

For Expert Advice — CONTACT US

AGM Deep Cycle Batteries Australia


Giant Power 12V 100AH AGM Deep Cycle Battery
Nominal Voltage 12V 
Nominal Capacity (20HR) 100.0 AH
Dimension Length: 260 ±3mm 
Width: 168 ±2mm 
Container Height: 209±2mm 
Total Height (with Terminal): 209 ±2mm
Approx Weight Approx 28.2 Kg
Terminal M6
Container Material ABS
Rated Capacity 100.0 AH/7.0A (20hr,1.80V/cell,25°C)
Max. Discharge Current 1200A (5s)
Internal Resistance Approx 4.9mΩ
Operating Temp.Range Discharge : -15 ~ 50oC (5 ~ 122oF)
Charge : 0 ~ 40oC (32 ~ 104oF )
Storage : -15 ~ 40oC (5 ~ 104oF)
Nominal Operating Temp. Range 25 ± 3°C (77 ± 5°F )
Bulk Charge Initial Charging Current less than 30A.
Voltage 14.5V @ 25oC
Temp. Coefficient -30mV/oC
Float Charge No limit on Initial Charging Current
Voltage 13.5V @ 25oC
Temp. Coefficient -20mV/oC
Capacity affected by Temperature 40oC (104oF) 103%
25oC ( 77oF ) 100%
0oC ( 32oF ) 86%
Self Discharge Giant Power Deep Cycle AGM batteries may be stored for up to 6 months at 25oC(77oF) and then a freshening charge is required. For higher temperatures the time interval will be shorter.

AGM State of charge to battery voltage chartMake sure that the battery is never discharged below 10.8 volts. If AGM batteries are discharged past this point permanent damage will occur. We recommend that you closely monitor the battery voltage / discharge levels via a digital volt meter or battery gauge.

Avoid Over Discharging & Protect Your Investment: Make sure that the battery is never discharged below 10.8 volts. If AGM batteries are discharged past this point permanent damage will occur. We recommend that you closely monitor the battery voltage / discharge levels via a digital volt meter or battery gauge. We also highly recommend the use of a low–voltage cutout device, these devices are not expensive and will protect your batteries by disconnecting any electrical loads from the battery before the batteries are over–discharged. 

Avoid Overcharging - Use Automatic Chargers & Regulators: It is essential that any device used to charge your battery is regulated with a maximum bulk charge of 14.8 Volts and a float charge of no more than 13.8 Volts - The AGM or Flooded/Wet setting on most automatic charge devices is acceptable.


How to Maintain your AGM Batteries

As with all batteries correct maintenance is important – particularly if it’s unlikely to be used for an extended period of time. With that in mind there are a few core points to follow:

1. Ensure your AGM battery is fully charged before being left. A fully charged AGM battery should read 13.00v or above. Ideally you need to ensure the final charge is done via an AGM optimised charging profile.

2. Never leave a battery on permanent charge (including trickle!) – despite having no free flowing acid inside, long term charging will cause the battery to dry out. Once fully charged and stored just ensure you charge the battery once a month overnight instead.

3. Try to keep your max discharge level to less than 80% . You can technically take AGM batteries lower than that, but the cycle life will reduce accordingly. For ultimate performance lifespan discharge to 50% then recharge back to 100%.

Note: Remember, the cycle life is a guide on the optimum life span of the battery – it doesn’t mean the battery will pack up and stop working – but you will notice considerably less running time once the cycle life has been achieved. Our Battery warranty does not cover loss of capacity as this is subjective to the usage, the frequency the battery is under and whether it’s been correctly charged.

If you are looking for true deep cycle batteries designed for regular discharge and recharge then AGM Batteries can offer all the power benefits you require. No topping up with water, non-spill, quicker charging and long life. If you can invest some time in getting your charging right, then you will see much better performance over traditional wet lead acid types – something we have first hand experience of over many years – low return rates and minimal warranty issues speak volumes for our Giant Range of AGM Batteries performance over time.

5 year battery warranty - 12 month full replacement warranty with 48 month pro-rata replacement warranty

Note: When a defective product is being returned for a replacement, the original item must first be returned before a replacement unit is dispatched.

It's important to follow the guidelines provided for AGM (Absorbent Glass Mat) batteries to ensure their optimal performance and lifespan.

** Discharging AGM batteries below 10.8 volts can indeed lead to permanent damage.

To prevent this, consider the following recommendations:

  1. Monitor Voltage Levels: Regularly check the battery voltage using a digital voltmeter or battery gauge. This helps you stay informed about the state of charge and prevent the battery from discharging too much.

  2. Set Voltage Limits: Implement a system or use devices that automatically cut off power or provide a warning when the battery voltage approaches the critical 10.8 volts. This can prevent accidental over-discharge.

  3. Charge Timely: Recharge the AGM battery promptly when its voltage drops to a level where it may risk permanent damage. Avoid leaving the battery in a discharged state for extended periods.

  4. Use a Battery Management System (BMS): If applicable, utilize a BMS that can monitor and manage the charging and discharging of the battery. Many modern batteries come with built-in BMS for added protection.

  5. Follow Manufacturer Guidelines: Always refer to the manufacturer's recommendations and guidelines for the specific AGM battery model you are using. Different batteries may have slightly different voltage specifications and charging requirements.

  6. Consider Voltage Alarms: Install voltage alarms or monitoring systems that provide audible or visual alerts when the battery voltage approaches critical levels. This can be especially helpful in applications where continuous monitoring may not be practical.

Remember, proper care and maintenance are crucial to extending the life of AGM batteries. Regular monitoring, timely recharging, and adherence to manufacturer guidelines will help prevent over-discharge and maintain the health of the battery.


For more information, please read our full warranty policy

No product reviews yet - be the first! Write a product review
Reactivating and charging a lithium battery that is inactive
Introduction: Unboxing & Care of your Battery
Selecting the Best Deep Cycle Batteries for Camping, Caravan, Marine, 4WDs and Off Grid Solar
Ardent Heavy Duty Battery Box & Deep Cycle Battery Box Kit

Explore our Video Library