Max Pack Charging Speeds

[phaduman]

Gen2 R1T Max Pack 1st experience - this one was with a Tesla Supercharger in Auburn (v3, 250Kw): at 75% battery (315 rated miles) @ 100kw. My Model Y at 75% battery (236 rated miles), would be charging at 70-80kw by then.

Session details:
* 36 minutes
* 72 kWh total consumed
* 198 miles added (36% - 78% likely...sorry didn't take screenshot)
* average charge speed 120kW (calculated from 72kWh in 36mins)
* $42 (59c / kWh) - using Rivian app (not Tesla app)

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[emoore]

Gen2 R1T Max Pack 1st experience - this one was with a Tesla Supercharger in Auburn (v3, 250Kw): at 75% battery (315 rated miles) @ 100kw. My Model Y at 75% battery (236 rated miles), would be charging at 70-80kw by then.

Session details:
* 36 minutes
* 72 kw total consumed
* 198 miles added (36% - 78% likely...sorry didn't take screenshot)
* average charge speed 120kwh (calculated from 72KW in 36mins)
* $42 (59c / kwh) - using Rivian app (not Tesla app)

Just FYI, speed is in kW and energy is kWh

 

[sawjai]

Gen 2 R1S Max Pack
1st Tesla Supercharger v3 session with battery below 20% SoC (17%).

Session details:
43 minutes
99.652 kWh total consumed
280 miles added: 17% - 85%
$42.85 ($0.43 / kWh)

 

[mkhuffman]

Gen 2 R1S Max Pack
1st Tesla Supercharger v3 session with battery below 20% SoC (17%).

Session details:
43 minutes
99.652 kWh total consumed
280 miles added: 17% - 85%
$42.85 ($0.43 / kWh)

Coming from a Mach-e, I don't understand why people are complaining about that. To me it is very reasonable. When it stretches to an hour, I become very annoyed. But 41 minutes to 17-85% is reasonable, IMO.

 

[sawjai]

Coming from a Mach-e, I don't understand why people are complaining about that. To me it is very reasonable. When it stretches to an hour, I become very annoyed. But 41 minutes to 17-85% is reasonable, IMO.

I was actually pleased with the charging results.
At the same charger when I had started from 26% to 85% at the same time of day and similar temperature / conditioning time, it took 38 minutes.

I typically don't get below 20% before charging with the way we've been driving, so to see it only take 41 minutes from 17-85% definitely will be a plus when we take some longer road trips later in the year. So far with 1,900 miles logged we're averaging 2.45 driving 70 on the freeway, it's about a 70/30 split of highway/city driving.

 

[HaveBlue]

People don't realize the charging benefit of the max pack because they consider percent charged. Try adding 80kw to a model Y and see how long it takes compared to adding 80kw to a max pack. You have so much more taper space.

 

[CharonPDX]

People don't realize the charging benefit of the max pack because they consider percent charged. Try adding 80kw to a model Y and see how long it takes compared to adding 80kw to a max pack. You have so much more taper space.

"to a model Y" sure.

The problem is that the max pack adds "total kW" slower than the Gen 1 large pack! Out of Spec tested a Large pack and a Max pack of other-than-battery-pack identical specs (2024 dual non-perf on 21") at the same time in their "10% challenge" - where they arrive at a charge station at 10%, charge for exactly 15 minutes, then see how many miles they can drive at 80 MPH until they drop to 10% again.

The Max pack's charge curve was *WORSE*. Not just in %, but in kWh-delivered. The Max ended up being slightly more efficient, completely balancing out the kWh deficiency, causing both to go the same distance on 15 minutes worth of charge. (For comparison, a 2025 Tri on 20" wheels got only one mile less.)

The Gen 1 Large pack holds peak amperage far longer than the Max pack:

 

[SeaGeo]

"to a model Y" sure.

The problem is that the max pack adds "total kW" slower than the Gen 1 large pack! Out of Spec tested a Large pack and a Max pack of other-than-battery-pack identical specs (2024 dual non-perf on 21") at the same time in their "10% challenge" - where they arrive at a charge station at 10%, charge for exactly 15 minutes, then see how many miles they can drive at 80 MPH until they drop to 10% again.

The Max pack's charge curve was *WORSE*. Not just in %, but in kWh-delivered. The Max ended up being slightly more efficient, completely balancing out the kWh deficiency, causing both to go the same distance on 15 minutes worth of charge. (For comparison, a 2025 Tri on 20" wheels got only one mile less.)

The Gen 1 Large pack holds peak amperage far longer than the Max pack:

These out of spec charts are misleading. The max pack chart is a single charge, and the large pack ia a theoretical max over multiple chargers.

I have a Gen1 large pack, and a Gen2 max pack. The Gen2 will hold max amperage quite a bit longer.

The absolute max I've seen my Gen1 large pack hold max amperage was 21% added (about 10 minutes). This is consistent with what other owners have logged as well. Whereas I've seen the max pack hold max amperage for somewhere between 30% and 40% added.

 

[Budman]

I can state with a high degree of statistical confidence that my new Gen 2 Max Pack R1T charges as fast or faster than my Gen 1 Large Pack.

I've used primarily Electrify America on my road trips (very successfully). The charging session data is shown below.

** There are 39 charging sessions at EA chargers shown in the chart below.

** The chart shows how long it takes (minuets) to add a given amount of energy (kWh).

** Empty batteries charge faster than ones that are now so empty so this data is binned into groups by the starting state of charge of the battery. 10% to 20%. or 21% to 30%. or 31% to 40%.

** A logarithmic curve is fit to the data.

CONCLUSION: GEN 2 MAX PACK IS THE SAME OR PERHAPS JUST A BIT FASTER THAN GEN 1 LARGE PACK WHEN THE STARTING STATE OF CHARGE IS BETWEEN 10% AND 20%.

In my experience the Rivian R1T will charge at 190 kW and higher for a long time.

Proper preconditioning is critical. It can take 20 to 30 minutes of preconditioning while cruising at freeway speeds to get the battery temperature in the proper range, which appears to be around 85 to 90 degrees F.

Adding around 70 kWh of energy in 25 minutes is the most efficient use of charging time. After 70 kWh the curve starts to ramp upward meaning it's taking longer and longer to add every extra kWh.


PS: The OOS 10% challenge is perhaps an entertaining YouTube video but I don't feel it is good advice to follow on actual road trips for a multitude of reasons.

 

[HaveBlue]

My max pack also doesn't exhibit a massive drop like Kyle experienced.
His chart posted here shows soc% which is Apple's and oranges when comparing two different sizes packs and there's no time component. Not going there and wasn't my point anyway.

Here's the closest I have to a 15 minute charge for the heck of it. It gave me 46kw and added 110 real world miles for my vehicle. A Tesla will go further on 46 kw but that's not the battery's fault.

My same example could be with a Rivian lfp pack versus a max pack. Let's see which can add 90 kw faster.

Kyle's tests are arbitrary and constructed. Charge 15m and drive 80mph. Many people can't do that due to speed limits or traffic. Maybe they want to stop for lunch and not just 15m.

The EPA tests are arbitrary too. 55mph low speed mixed with city. 46kw times EPA would have been 124 miles added.

My tests are arbitrary too. My trucks lifetime and how I travel.

 

[sawjai]

I've been testing being over and under 20% SoC and the most bang for the buck charging session wise seems to be under 20%. All have been on Tesla Supercharger v3 units. Will try EvGO and EA at some point, but those chargers aren't as convenient for where I typically go or are always full.

Gen 2 R1S Max Pack

Session details:
42 minutes
85.260 kWh total consumed
242 miles added: 26% - 85%

42 minutes
94.121 kWh total consumed
267 miles added: 21% - 85%

42 minutes
98.431 kWh total consumed
277 miles added: 18% - 85%

 

[Viet658]

Seems like Rivian heard us.
https://riviantrackr.com/news/whats-coming-in-rivian-update-2025-18/

 

[Hereforthesnacks]

People don't realize the charging benefit of the max pack because they consider percent charged. Try adding 80kw to a model Y and see how long it takes compared to adding 80kw to a max pack. You have so much more taper space.

Sure, but you don’t need to add 80kw to a Y because it’s way more efficient. So, you maybe only need 50kw in a Y to get the range from 80kw in an R1

 

[mkhuffman]

I have not had my truck for very long, but I've done several DCFC sessions. In my experience, it takes about 40 minutes to go from 10% to 80%. That is totally reasonable, IMO. It's faster than my Mach-e was with a much smaller battery.

Now they're going to improve it, which is fantastic. But I will be surprised if the Improvement is more than 5 minutes 10-80. Maybe they are going to improve the speed when you start at 50% and just want to go to 80? That would be welcome, because it really starts to slow down after 70%.

 

[HaveBlue]

Sure, but you don’t need to add 80kw to a Y because it’s way more efficient. So, you maybe only need 50kw in a Y to get the range from 80kw in an R1

True, but the same comparison can be had with a Rivian Standard pack vs. a Rivian max pack. Maybe that's a better analogy trying to gain 100kwh.

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