It’s one of those questions: How much does an AGM battery weigh? That can cause nagging doubts about your vehicle, boat, or stand-alone off-grid solar installation. Like a tickle at the back of your mind asking if an AGM deep cycle battery is going to be too heavy?
Would I be better opting for a lighter LiFePo4 battery? I will be answering both questions and more to help you make an informed decision. Starting with the average weight of a 100Ah AGM battery I will then be presenting other weights.
Then comparing weights with LiFePO4 batteries and look at the advantages and disadvantages.
How Much Does An AGM Battery Weigh?
“The average 100Ah deep cycle AGM battery weighs 65.87lbs or 29.88Kg. I arrived at this conclusion by collecting the weight data of ten AGM 12V batteries. The lowest battery weight being the Weize at 57lbs/25.85Kg and the highest Narada at 77.2lbs/35Kg.”
What Are The Average 100Ah AGM 12V Deep Cycle Battery Dimensions?
I also collected the dimensions of the 10 batteries. This shows the average battery size to be 13.26 x 7.08 x 8.29Inch or 336.8 x 178.3 x 210.6mm. Below is a table showing each individual 100Ah AGM battery weight and dimensions.
|100Ah AGM Battery||Lbs Weight||Kg Weight||Length (Inches)||Width (Inches)||Height (Inches)|
|Light Catcher Solar||66lbs||30Kg||15.98||9.29||6.81|
|Universal Power Group||63.93lbs||29Kg||12.17||6.16||9.16|
How Much Do Other Capacity AGM 12V Deep Cycle Batteries Weigh?
There are several other 12V AGM deep cycle battery capacity sizes that weigh different amounts. Below is a table of some of the most popular sized batteries with their weight and dimensions.
They are individual batteries, not an average of several battery sizes and weights. But the table will give you a good idea for comparison purposes which size battery may fit your needs. I have included the 100Ah average but not included the battery’s make to protect the innocent.
|12V AGM Battery Capacity||Lbs Weight||Kg Weight||Length (Inches)||Width (Inches)||Height (Inches)|
Very obviously you can see the higher the amp-hour of the battery the heavier it becomes. But you knew that, didn’t you?
The deep cycle batteries also increase in size as the amp hours go up. Rather than the battery becoming much taller apart from the difference between a 30Ah and a 250Ah. The batteries become longer which is important when it comes to fitting them in the available space.
If You want to know about AGM battery voltages follow this link;
What Is An AGM Battery?
An AGM deep cycle battery is used to provide electricity where there isn’t a grid hook up. Off-grid use is popular with campers, RV users, and trailer owners. They are now starting to be used widely in stand-alone solar installations.
Campervan HQ say;
An Absorbed Glass Mat (AGM) battery is another type of sealed lead-acid battery, invented in the 1970s, and very popular for RV use. Unlike a flooded lead-acid battery, all the liquid electrolyte in this battery has been absorbed into the fiberglass mats, which makes for a spill-free battery. (Source; campervan-hq.com)
You can take a look at my article about AGM battery alternatives here;
But how do they stand up to lithium based deep cycle batteries? Let’s take a look.
How Much Does A Lithium Iron Phosphate (LiFePO4) Weigh Compared To An AGM Battery?
I will be using individual 12V batteries and their capacities for this comparison. I have once again left the battery make out.
(L x W x H)
(L x W x H)
|35Ah||9.9lbs/4.49Kg||23.1lbs/10.48Kg||7.7 x 5.22 |
|7.76 x 5.16 x 6.26|
|50Ah||14.7lbs/6.7Kg||32.2lbs/14.6Kg||7.8 x 6.5 |
|7.80 x 6.54 x 6.73|
|75Ah||23.6lbs/10.7Kg||49.1lbs/22.27Kg||10.2 x 6.6 |
|10.24 x 6.61 x 8.27|
|100Ah||26lbs/11.8Kg||65.87lbs/29.88Kg||11.4 x 6.8 |
|13.26 x 7.08 x 8.29|
|150Ah||36.7lbs/16.65Kg||96lbs/43.54Kg||13 x 6.9 |
|13.46 x 6.77 x 11.95|
|200Ah||62.2lbs/27.3Kg||132lbs/59.87Kg||20.55 x 9.45 |
|20.76 x 8.70 x 8.64|
|250Ah||80lbs/36Kg||154lbs/69.85Kg||20.5 x 9,5 |
|20.47 x 10.55 x 8.66|
What Are The Weight And Size Differences ?
You can see that deep cycle lithium batteries are predominantly less than half the weight of an AGM. But the physical size of the batteries aren’t too dissimilar.
The difference becomes apparent when considering battery capacities. Lets use a theoretical 70Ah battery discharge also known as depth of discharge or DOD. If you don’t already know, an AGM battery can only be discharged to 50% of its capacity.
This is because discharging beyond that point will almost certainly damage it. Reducing its life cycle and even preventing it from being fully recharged ever again. It is possible to damage it so badly by over-discharging that you have to replace it. This is true of all lead-acid based batteries.
Some say AGM’s are different to Gel and Flooded and can be discharged to 80% of capacity but not on a regular basis. There are plenty of horror stories out there were an AGM battery bank lasted 500 cycles and had to be replaced. Due to being regularly discharged by over 50% of their capacity.
Whereas it is theoretically possible to discharge a LiFePO4 battery to 0% without causing damage . But I wouldn’t recommend doing that on a regular basis. Most guidelines say discharging 80% of its capacity should have no damaging effects.
The Advantages Of Weight and Size LiFePO4 Batteries Have Over AGM
I digress please accept my apologies back to that theoretical 70Ah battery discharge. So this means a 100Ah battery is required. Hang on a minute, that’s fine for a LiFePO4 battery but not for the AGM.
A 100Ah battery isn’t large enough because at 50% allowable discharge that comes too 50Ah. So let’s take a look at the weight and size of a 170Ah AGM. Because a 170Ah will have 15 amp hours of wiggle room against the 70Ah discharge.
The Comparison 100Ah LiFePO4 V’s 170Ah AGM
I am going to use the Renogy 12V 100Ah LiFePo4 and the North Star 12V 170Ah AGM battery.
|Specs||Renogy 12V 100Ah LiFePo4||North Star 12V 170Ah AGM|
|Dimensions (Inches)||11.4 x 6.8 x 7.4||22 x 4.9 x 12.6|
|Cycles||4000 (80% Capacity)||2050 (50% capacity)|
To be completely transparent with you I searched Google for a 170Ah AGM battery for this comparison. And chose the first result which was the North Star. I already had the Renogy stats.
In the earlier direct like for like comparison of battery capacity sizes. It looked like the only real difference between the two battery types was how much they weigh. But the above comparison shows a different story.
The Weight And Size Difference
So let’s look at the weight difference first. It’s actually a whopping 106lbs. I actually went back to make absolutely sure my stats were correct. The North Star is certainly a meaty boy!! I know it’s American made and the Renogy is made in China.
But you can compare it to the American made 100Ah Battle Born which weighs 31lbs. Its dimensions are 12.76 x 6.86 x 8.95inch. But it doesn’t hide the fact that the North Star is a tad on the weighty side. Do you want something that heavy in your RV, Camper, Trailer or Boat?
It’s also quite a lot bigger than both the Renogy and Battle Born which may create a problem with space. With regard to space you can install an AGM battery on its side just like a Lithium battery.
You might think that I am being overly cautious using a 170Ah AGM against a 100Ah LiFePO4 for comparison. But remember the earlier table I produced for battery weights and sizes. Dropping down to a 150Ah AGM still weighs around 96lbs/43.54kg with dimensions of 13.46 x 6.77 x 11.95 inches.
Life Cycle and Price
The cycles are an interesting comparison. With the LiFePO4 holding 80% of its capacity after 4000 recharges and the AGM 50% after 2050 recharges. If you’re interested the Battle Born holds 75% to 80% of its capacity after 3000 recharges.
This suggests the North Star AGM has only half the lifespan of the Renogy LiFePO4 battery. This means you would potentially have to buy two North Stars over the lifespan of the Renogy. At current prices that means you will have spent $1097.98 on two North Stars and $759.99 on the Renogy.
That is a saving of $337.99 which isn’t too shabby when you also consider the weight and space savings. But there is the sticking point of the initial extra $200 layout. I will leave that with you to chew over.
There isn’t really a saving where the Battle Born is concerned because its list price is $949.00. So if you are thinking it might suit you better than the Renogy. You could hold out until it comes on sale.
My Closing Thoughts
The weight of the battery depends on its capacity which makes it difficult to give a definitive answer. A 35Ah battery can weigh 23.1lbs/10.48kg but capacities over 150Ah weigh more than 100lbs/45.36kg.
The problem is further compounded because of the manufacturers. They do not construct their batteries to the same weight within a capacity class. Proved by my initial investigation of 100Ah AGM battery weights. Which ranged between 57lbs/25.85Kg and 77.2lbs/35Kg.
Comparing the weight of AGM to LiFePO4 deep cycle batteries proved to be eye-opening. With like for like capacity batteries showing LiFePO4 to be less than half of the weight of an AGM. But the real insight came when comparing against a notional 80Ah battery discharge per day.
This showed that a single 26lbs/11.8kg 100Ah LiFePO4 could safely discharge the 80Ah. Compared to having to use a 132lbs/60kg AGM lead-acid battery to discharge the same. If you would like to look at a LiFePO4 battery review you can do so here;
I hope you enjoyed this post and have found it helpful. If you have any questions about the weight of AGM batteries. Or want to leave your own personal review, please feel free to leave a comment below.