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Hey folks - this is my first winter with my R1S, so I wanted to share something and see if it's "normal" or cause for concern.

For background, I bought my R1S in May. It has the Max battery (400mi range). The SoC and estimated range have always been a perfectly linear relationship: when the battery is at 50%, the estimated range is 200mi; battery 60%, range 240mi; etc.

Starting last week or so (around when we had consecutive days with single-digit temps here in MN), the SoC-to-range relationship is no longer linear. Right now for example, it's at 52% with 201mi estimated (would expect 208mi).

Any others seen this? Is this just the cold-weather impact on the battery, or is this some sudden battery degradation that I need to be concerned about? And if it's just a winter thing, I assume it rebounds back to normal in the warmer months?
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Gleatherman
100% winter. You’ll see up to about 30% drop in range at single digit temps. Do you monitor the efficiency screen at all ? I rarely trust the general soc- the trip finder will always adjust as range varies depending upon travel efficiency levels
cheapseats
Thanks for the quick reply. Good to know! I had not noticed the efficiency screen showing anything usual -- maybe because it's not super pronounced - but will keep tabs on it there too. I appreciate the tip!
Lawrence-of-Blaine
If you take a drive of any length, watch the projected range change as the battery warms up. Also, keep notes if you want, on the relationship between your speeds and remaining range. Multiple variables will alter your projected range in real time as you drive. Over time you'll get a feel for all of them rolled together, but start with the knowledge that a cold battery is a range-killer, and faster driving is a range killer...especially long highway trips. You'd be amazed at the boost you'll get with slower speeds on back roads vs. highway, let-er-rip trips.
ThumprMN
ThumprMN
Yes, winter has a noticeable impact, but it also exaggerates the lower efficiency you get on short trips. A cold battery that can warm up will release more range and efficiency, but it takes time and if you are commuting around town and it never has time to warm up, then it feels exaggerated. Taking a longer trip gives the battery a chance to warm up and more accurately unlock battery range. Additionally, get used to paying attention to wind speed and direction, Wind always has an impact but when you’re more aware of range decrease, its helpful to understand how the winds are having an impact.
cheapseats
Thanks all. Yes, I’ve definitely seen the efficiency change when driving faster or slower on the higher for longer trips. Good to know that winter temps are to blame for what I’m seeing lately with normal driving.





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