How long should battery drain take?

there are a number of influencing factors, but a few minutes is probably an average.

 

did you have the a/c on?

 

a/c is what chews up the battery, and of course, temp and humidity make it difficult for owners to compare.
whatever you do, don't go through a carwash that makes you put it in neutral.

 

You can run it through a "pull through" carwash that requires you to put it in neutral, as long as you have 6 - 7 bars and you turn off the A/C. A/C on a hot day is the big drain on the battery.

For piece of mind, you can get your car battery full by "force charging* and then turn all accessories, including the A/C. off. Then sit in the car with a timer running and time how long it takes to get to the 2nd bar (1st purple bar) when the ICE kicks in. A reasonably healthy HV battery (and 12 V battery) will go for quite some time. NB, the car is in READY for this complete test.


* Force Charge: Make Car READY; Place Foot Park Brake on securely; Place Left foot on brake pedal and press firmly; Place in 'D'; Press accelerator down fully; When HV Battery icon lights the 8th Bar, continue charging until the charge flow line will start alternating in/out (takes longer than you would think). HV battery is now fully charged *(to 80%). Stop charging and place in 'P'. (Don't forget to release foot park brake, if you're not in the habit of using it!)

 

I am going to simplify, the Prime does have a sprag clutch, but not much, it really is simple mechanically.

Your Prius is really always in D. It is a single speed transmission with no clutch.
To emulate R, the electric motor called M/G2 rotates backward. The speed of the car is ALWAYS directly proportional to M/G2 speed, so if M/G2 is going backwards, so is the car.
To emulate P, a pawl drops into the gears, preventing M/G2 from moving.
To achieve B, the computers start rotating the engine without giving it gas, so it acts as an air pump, wasting energy. Since the goal of braking is to get rid of energy, this is normal. (In D more kinetic energy is dissipated by charging the battery)
To emulate N, no electricity is allowed in or out of M/G2 and M/G1, so the engine has nothing to push against and no charging takes place. (the car is really in D, and if you coast, the motors do spin, but no electricity is getting in or out. This is why towing with the front wheels on the ground is bad)

Both B and N are required by US law, as is the gear pattern. (except B, Toyota could put B where ever they wanted)

 

I just wish I could find theses mile long car washes everyone here uses. Mine takes about 45 secs (no kidding) to go through.

 

The one I use, the car remains stationary and the apparatus moves around it. Very Prius friendly.

 

Yeah, that's my plan B wash option which takes about 3 times as long but the pull-thru even as short as it is cleans better.

 

To the OP: Here's an excerpt from a recent post of mine:

"Condition of TractionBattery (maintained using HybridSystems Prolong Grid Charger): I was sitting in the car, which was in "READY" mode, and with the A/C on (well, it was 95+ degrees out, with dreadful humidity) and after about 10 minutes, I saw the SoC had reduced to about 40% (2 purple bars on the MFD ), so the ICE came on, which was to be expected.
I later used the car to run an errand, and after about 10 mins, the SoC was back to 70%, and more driving this morning showed the Soc and MFD display to be working normally.
Anyway, just FYI of anyone who might be interested…"

…so, to answer your (OP) question, about 10 minutes! - hope this helps - Wil

 

Well, some folk just expect the world to move around them!

 

That's because all bars aren't created equal. Rule of thumb, each one represents a different percentage.

 

On the face of it these timings indicate a HV battery in reasonably good shape, even considering the age.

This is consistent, if you reference the graphic in post# 16 above, it shows why. When you graph the SoC (state of charge) under load, over time, you see that the line is shallower 80% to 60% and then steepens from 60% to 40%. So, that it is doing this is not unusual or "bad" as such. More important is overall time for the drop from 80% to 40%.

Not quite sure I understand the process and where it fits in with the timing above. Are these additional data points after the above timings?

Yup.

This is the only thing that concerns me. I recently tested another Prius HV battery and it showed this as well. Until I do more of my own testing I will reserve comment as to whether it indicates anything or is good or bad. Suffice it to say, all other aspects of the HV battery I tested showed positive results, much like yours above. One thing to remember, thee charge is at around 60-70 Amps whereas the discharge (all things being equal) is around 5 Amps, so it is expected that the charge back up will be faster than the discharge.

I would say, on balance, you can relax and now focus on driving this great piece of engineering.

Footnote: The point of me asking you to do this test was to show you that your car will be ok for 5 -10 minutes in a carwash – with the conditions I mentioned in my first post (post# 8).

 

Thats a tired hybrid battery. My bought new 07 started doing the 2 blues to one purple bar at the drive through too at 100K miles. The battery was showing signs of rapid deterioration. You have not throw any trouble codes yet so you have a small window to improve the battery. I bought a Prolong Charger/Discharger and did a full discharge and charge and its been much much better for the last 4 months.
It really wakes the battery up.

hybridautomotive.com


Even my wife said it does not go into purple bars anymore. Not sure how long it will last though...
At the age of the car it is inevitable to have to replace the hybrid battery. It helps to keep it cool with really good tint and extend the rear package rack to keep direct sunlight off it and keep the cabin very cool as in don't drive around with the windows open.

Its quite a roll of the dice though to buy a used G2 at its age. You can look at the cars history by going to toyota.com/owners and join the forum and enter your vin.
It will show you every instance the car has seen a Toyota dealer. You may see why the car was sold.
Sometimes thats good sometimes its very bad.