Dual Battery

Johnny R
Do you want the battery just for a fridge alone? if so, why buy an expensive battery which is able to also do start loads? The Dual Force is most likely a good battery though. What is the capacity and cost???
In an emergency most decent sized AGM batteries will start a vehicle, not recommended for life span but emergency is emergency.

Better to buy a definite AGM deep cycle for fridge use. Any 100AH AGM deep cycle battery should weight at least 30KG for it to have enough internals to be capable and long lasting under continuous cycling. If the 100ah, eg, battery you select is less than 30kg then it may test as a 100ah but that performance won't last because there is insufficient material in their construction. Most 100ah ebay batteries weigh less than they should for the claimed performance. You will only use it on trips, so a charge regime should be incorporated so the battery receives a top up charge frequently when at home. ie, daily or weekly timer and operating a charger for a short time, eg, 10min. Do not static store and forget and only charge when sometimes remembered. That will kill the battery life.
If doing that then buy cheap batteries as they will be getting replaced more often.

My 100 ah FullRiver which now has only 50% capacity, used on trips and charged as above is now over 10 years old.

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Johnny, let's be clear.

Are you.....
a) Fitting a new single battery to both crank the engine and power the fridge?
or b) Adding an auxiliary battery and still keeping a cranking battery?
And if b), is the auxiliary AGM being installed in the engine bay?

I ask because AGM batteries suffer from high temperatures in the engine bay.
Even the common flooded lead-acid cranking batteries will last longer if not subjected to high temperatures, but locating them away from the starter motor introduces other compromises. AGM batteries of any brand are better located away from the engine.

Then the second point......... If a) using a single battery for both cranking and supplying the fridge, then you run a real risk of the fridge depleting the battery charge such that it is then unable to start the engine. Not good, especially if you are alone and remote. Best to have two separate batteries for the separate tasks.

One thing to remember John if you don't use it you might loose it as some people only use their agm battery a couple of times a yrs then wonder why it won't hold charge. The more you use them the better they seem to work and last my both agm's get used a lot and are fine but my neighbour had trouble with his holding power he only used it a couple of times a yr and I've been telling him for 4yrs to use it more. He was lucky he ended up buying a charger which cost him money he didn't need to spend and let it go through it's conditioning cycle and it is fine now.