2023 Prime battery: maker, chemistry, form factor?

I was a little confused about that 13% as well, as like you, my dash and app show about 30% in reserve once EV is gone. And all references online show 30% reserve also. BUT 11.8 leaves 1.8 and that's 13%.

My Volt did a much better job of showing you what was going on. It would tell you after each charge/trip how much kwh had been used. But the Volt never used 100% to preserve the battery. It would only charge to ~80%. About ~13.7-14 kw's of the almost 17 kw battery capacity. But it didn't leave near as much in reserve as the Toyota. It would also never switch back to EV mode no matter how much regen braking you did. My Prius will. I have wondered if the 30% was also leaving a little at the top end empty for the same reason Chevy did. But like you said, 11.8 x 4.1 = 48. So if you are getting 48, it does seem it's only leaving 13% free, most I'd think for HV use. And no headroom at the top for battery life savings.

To make it more muddy, when I recharge from 30%-100% the app tells me I only used about ~7kw to do so. That also seems wack. Doesn't make a lot of sense to me. Toyota is not nearly as helpful as Chevy was on sharing what's going on behind the scenes. The volt would tell you how many miles you did on EV and how many on ICE. Both per trip, per charge, and lifetime.

It also used the computer to tell you when to change the oil. It took into account age, amount of time on ICE, engine load, temps, RPM's and several other factors. Toyota's like... Meh... every 10k. Good enough.

 

Never used it myself, but the consensus is the app has not been properly set up for the G5.

[2023 Prime] Battery Reserve | PriusChat

Latest Dr Prius SOC vs Car SOC | PriusChat

Edit: I guess another possibility is that they were to thinking to imitate the SoC gauge in the car, which positions the HV/EV boundary at about 30% in an extremely non-linear graph, but they've ended up showing that "percentage" as a number, quite different to the "% EV remaining" number the car shows.

This was a boost of an older thread prior to good analysis of the G5 battery behaviour, and I don't actually know where the "87%" and "11.8kWh" numbers in @Prius23years' post came from - I can't see 87% or 13% anywhere in this thread or links.

Edit: doh - just figured it out. It was in a post from someone I've blocked - in part for spouting inaccurate information. Makes sense. Although Prius23years misinterpreted the 87% for HV+EV as 87% for EV.

From those other threads, 78% / 10.6kWh is a better estimate of the amount available for EV use, then up to 5% / 0.7kWh of HV band, and at least 17% / 2.3kWh in reserve (9% at the top - the reserve uncertainty is how low it goes).

 

KMO, thanks, I was unaware of the two later threads. The Latest Dr Prius SOC vs Car SOC | PriusChat one is particularly informative.

So I take it we can conclude that:
a) The MyToyota app values are inaccurate regarding SOC when the EV mode is no longer available
and
b) The amount of battery available for EV use is about 78%/10.6kWh

As an aside, when charging from zero EV range up to full (or rather to the point where charging automatically stops) the MyToyota app under charging history says that the energy delivered was 11.4kWh (that is using my EV charger point in my garage which is capable of supplying up to 7.2kW but in the case of the Prius plug-in hybrid is limited by the onboard charger to a maximum 3.6kW charge rate.