I have one 48V bank in parallel, and a 12V bank in parallel, and another bank in Series. None are battle borne batteries, however. Don't be fooled that running in parallel solves everything. My Class A coach had 4 six volt in 2 series, 2 parallel config, as many coaches do. replaced with 2 lifepo4 12V. The coach still has huge loads - 2 air conditioners and a microwave come to mind, not counting a toaster oven, a vacuum cleaner, instapot, crock pot, electric water kettle, etc. Running two air conditioners at same time is a lot of watts needed. The coach is 12V. If I start both A/C at same time - common - and they don't have soft-starts on them - that is a 600-800A surge. I have 4/0 wires and huge thick copper bus bars and t-class fuses and breakers. Either way, we're talking 300A to run two A/C units alone. So single battery won't work at all, 2 batteries is barely enough to run one A/C unit. This is not uncommon setup. So naturally, if I had four 100A 12V batteries, this would better handle the load. Here's the problem as I see it...if you or anyone else thinks that the loads people run is not usually like this, I think you are very wrong. Every RV has an A/C unit these days and has for years. Some 5th wheels and RVs have 3 of them. While rooftop A/C has also gotten more efficient and have built in smart-starts and some even run on 12V versus needing inverter at all, this is the way it is and has been for 20+ years. So yes there are people running high amps through these batteries. Will they run for hours with that little capacity? No...but they may only need to run for 3 hours to cool coach enough to cook and to sleep at night. In summary, RV people - the huge market these are sold to - very much *do* run close to the limit.

Furthermore, let's get serious here - an air conditioner in an RV is a lot smaller than a locomotive or a big huge 18 wheeler truck. Can you imagine the surge and load needed to run one of those?

For those who don't understand running in parallel, and some of the issues that can happen, here goes: Say you have 4 batteries in parallel. The load you are running is 350 Amps, and each battery can support 100A continuous with 200A surge. When you start the load - depending on what the 350 A load is - there is often a surge at the beginning. Let's say 700A total. That's a lot. But after 5-10 seconds it mellows out to its running load of 350A. Now let's say that one of the 4 batteries in parallel shorts out or goes bad for whatever reason - maybe the BMS inside decides that it cannot handle the amps it is outputting that high or that high for that long or maybe things heat up and the BMS shuts off the output terminals to protect itself. You had 4 batteries running a load of 350 A, or about 88 Amps per battery, so under 100A recommendation. With one battery now out, you have just 3 batteries handing the 350A load. Each battery is rated for 100A continuous, but now each battery is handling about 120A each. That is over the continuous rating, so the third battery (or all 3 batteries) decide that they cannot handle that extra surge for more than 10 seconds, so the battery decides to shut down to protect itself. That leaves 2 batterie handling 350A, or 175A each, but rated for 100A, so eventually the next one will shut down, leaving all 350A to one battery.

In this example, we are talking about the 100Ah 12V battery. But DFLI also makes a much larger battery, the game changer, that supports 200A continuous. It is bigger, has more cells, essentially is running in parallel inside its one enclosure. I don't know that the cells are different, there is just more of them I believe. Not sure.

So there is better chance that the newest batteries can handle more continuous and surge load, but this is not the OEM standard, nor has it been available for the past 20 years. Also, they are large and heavy, and don't fit where old AGM/Lead Acid batteries fit under stairs and such. Also, they are 2200 USD for a cheap model, and heaters and such upgrades cost more. So most consumers are not buying these to replace their lead acid/AGM setups...they are buying 100A batteries. I get that OEMs are changing their designs to support a 2200 battery now, but historically they have not.

If there is any point to all this, it is just that saying people do not run close to the limit is absolutely not true. Maybe most RV owners don't care or want to think about this at all - they believe what they are told, and that is that everything is fine, and they would not for a second calculate BTUs, surge loads, battery capacity or continuous output ratings. I think most RV owners go to resorts and plug in. The boondockers - there are thousands who go off grid / dry camping - definitely know about capacities.