Battery behavior after the "normal" charge is used?

I don't own a Plug in Prius, so I'll be careful in my response.

But my understanding is the PiP only has two batteries in the form of a Lithium Ion hybrid battery and a standard auxiliary battery.

The Lithium Ion Hybrid Battery is stronger than the Ni-Cad batteries in the regular Prius. You don't have a Ni-Cad hybrid battery. You only have one "Hybrid Battery" and that is your Lithium Ion one.

 

There never was a "Ni-Cad" battery in the Prius or Plug In Prius. In the Prius it is Nickle-Metal-Hydride battery

 

I think the 2010 "Beta test" Plugin Prius had an added EV mode battery with less room in the back as a result. The 2012+ production Plugin Prius only has the one Li-ion traction battery. The appearance of two batteries in the SOC display is just a matter of software.

 

The prototype had two separate packs. That's where these misinformation is from.

The production version only has one 4.4 kWh Lithium battery pack.

In EV mode, you have 38 kW from the battery. In normal hybrid mode, you only get 15 kW like a regular Prius with NiMh battery.

 

Sorry, I stand horribly corrected.
You are correct. It is a Nickle Metal Hydride battery not a Ni-Cad.

In my defense? It was 3:23 am when I posted.
And the OP planted the idea that it was a Ni-Cad in my weakened consciousness....

The important thing...is that the PiP doesn't have two Hybrid Batteries...just one stronger Lithium Ion battery.

 

When it goes into the HV mode after the EV miles are used it operates just like a normal hybrid, electric power available and speed limit for EV operation. This keeps the battery operation within the desired HV range. Step on the accelerator to get the power you need just like the regular hybrid, the ICE is already running or hot. The traction battery is Li-ion and the 12 volt battery is a sealed somewhat smaller regular car battery.

 

Right, the software creates the illusion of two batteries, whereas in reality the control software is just changing its management policy between hybrid and EV. How all this works doesn't seem to be publicly documented by Toyota anywhere. Pretty much all the information here has been extracted by owners, particularly those with their own diagnostic readout devices (OBD-II).

And the 12v battery is a miniscule little thing, since pretty much all it has to do is boot up the EV controller computer. When the gasoline engine needs to be started, that is done by one of the two motor-generators (MG1), powered by the traction battery.

 

The ICE kicks in much sooner in terms of torque demand and speed when you in that last fraction of a mile after the system switches from EV to HV, just like the normal Prius. Fortunately, in my case, I'm usually off the highway on 30 m/h streets at that point, or even going down the long hill to my house. That's another thing I like about the PHEV's battery: It can take all the regen of a long hill without ever getting to the "spill" point my former Prius would do.

 

What is the amp-hour capacity of the stock battery and where do you find that specification?

What a dummy.... I just had a look at my battery. 20 Hr 45 Ah CCA 325A. Also this battery appears to be an OEM Prius Battery at 35 Ah Yuassa HJ-S34B20R OEM JIS SPEC Prius Battery

So why is 45 Ah or 35 Ah miniscule?

 

I guess I was thinking of the physically small battery in my old Gen I Prius, compared to the relatively huge one in my wife's Honda Pilot (something like 64Ah). So I guess the 12V battery in the PiP is only "small", not "miniscule". At one point, someone was wondering if they could put 8 D cells together to start their Prius. I don't recall the resolution of that conjecture.

 

The Optima recommended battery for a 2004 Highlander (my previous car) is 8020-164 35 RedTop at 44 Ah or a YellowTop at 48 Ah so it isn't clear why 45 Ah is even close to "small". Lower capacities would depend on how you define "small". 15 Ah, 20 Ah......