Rivian's Brand-New LFP Battery Pack Gets Tested at a DC Fast Charger

Refreshed Rivian R1S with Standard Pack LFP Battery Charging Curve 35 photos
Photo: Out of Spec Reviews on YouTube | Edited
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Prospective Rivian buyers who want to get their hands on the most affordable R1T or R1S must now choose the 270-mile lithium iron phosphate (LFP or LiFePO 4) battery. Don't worry, it's not bad. After all, you're still buying a $70,000 all-electric pickup truck or a $76,000 three-row eSUV. Here's what you can expect in terms of charging performance.
A few weeks ago, we told you that picking the right high-voltage energy storage unit for your new Rivian can be challenging. We concluded that you would be best off with either the Standard Pack or the Max Pack. The middle option is too much of a compromise and doesn't seem to be worth the financial effort.

Let's say you took heed of our advice and decided that the Standard Pack is the one that best suits your mobility needs. This unit is not only a great choice because it's $7,000 cheaper than the Large, but it's also less prone to igniting when a crash might happen and can be charged to 100 percent without degrading faster.

It may not be as energy-dense as a nickel manganese cobalt (NMC) pack or accept power at 220 kW like the NMC batteries, but it does a pretty good job. A peak charging speed of 200 kW is A-OK – for now.

Oh, it also fares better in colder climates than other chemistries! Just don't let it discharge when it's below freezing outside or when the thermometer shows more than 95 F (35 C). This chemistry is a little more sensitive when approaching a minimum state of charge. The battery management software can't always figure out if you're about to run out of electricity or still have a couple of more miles left.

2025 Rivian R1S
Photo: Rivian
That's also why charging to 100 percent at least once a week is recommended. It allows the onboard computer to accurately measure and confirm the battery is healthy. It's also how you get accurate readings of the available range.

The numbers don't lie

So, what can you expect from Rivian's 92.5-kWh LFP high-voltage energy storage unit built on a 430V architecture in terms of charging curve? Well, according to an Out of Spec viewer who conducted an independent non-scientific test with a facelifted R1S, the battery pack starts pulling electrons from the dispenser at over 190 kW even when the vehicle is plugged in at close to zero percent state of charge (SoC).

It reaches a peak speed of 205 kW at 15 percent SoC and remains at or above 200 kW until 25 percent SoC. Thus, the battery's first quarter is replenished rather quickly.

From there on out, it starts dropping after every five percent added to the battery, as follows:
  • 26 to 30 percent SoC – 195 kW;
  • 31 to 35 percent SoC – 178 kW;
  • 36 to 40 percent SoC – 162 kW;
  • 41 to 46 percent SoC – 144 kW;
  • 47 to 52 percent SoC – 128 kW;
  • 53 to 57 percent SoC – 112 kW;
  • 58 to 63 percent SoC – 95 kW;
  • 64 to 68 percent SoC – 84 kW;
  • 69 to 74 percent SoC – 73 kW;
  • 75 to 80 percent SoC – 52 kW;
  • 81 to 86 percent SoC – 44 kW;
  • 87 to 100 percent SoC – 30 kW.

What this early analysis tells us is that you should charge your Rivian with an LFP battery at a DC dispenser up to around 70 percent. From there on, the charging speed decreases, and, unless you're getting ready for a lengthy trip, it no longer makes sense to occupy a fast-charging stall. It's not just about freeing the space for someone else; it's also about your time.

2025 Rivian R1T
Photo: Out of Spec Reviews on YouTube
If you use the built-in route planner, a different navigation app, or make your own calculations, you might even save some money. Charging at home, work, or your destination might very well be cheaper, if not even free. And dare we mention that driving an EV is great for local environments?

Improvements on the horizon

However, do note that a complete charging session like this one takes around 75 minutes. If you're not in a rush and don't care about the kWh cost, then you could take a break every 270 miles or so to fully recharge.

Keep in mind that this refreshed dual-motor R1S with the Standard Pack is a brand-new eSUV that might not have been fully charged prior to being delivered to the buyer. The pack could have needed such a charging session to stabilize the chemistry and allow the battery management software to get an understanding of what's happening within it.

A company representative told Out of Spec's Kyle Connor that an upcoming software update, due in August, will unlock more capability for this battery pack. It remains to be seen if Rivian can remotely improve what's arguably the best high-voltage energy storage unit for those who want to preponderantly use an R1T or an R1S as a commuting appliance.

A better charging curve would certainly be welcomed, even though 270 miles (435 kilometers) of EPA-rated range is more than enough for a daily workweek commute of around 42 miles (68 kilometers). You would even have something left in the tank for a Saturday stroll. On Sunday, simply charge at home during off-peak hours. On Monday morning, you wake up to a "full tank" and can go on with your week without thinking about gas costs or charging at a pricey DC dispenser.

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About the author: Florin Amariei
Florin Amariei profile photo

Car shows on TV and his father's Fiat Tempra may have been Florin's early influences, but nowadays he favors different things, like the power of an F-150 Raptor. He'll never be able to ignore the shape of a Ferrari though, especially a yellow one.
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