Good video! I have a 2004 Prius that had the hybrid battery Christmas tree come up. I replaced two of the cells for 45$ off eBay. I replaced them at 192,000 a year ago. The car now has over 220,000 on it and still running strong. I would gladly drop a new battery in it when the time comes. I have never owned a car that is so reliable and that hasn’t cost me tons of $$ to maintain. Riding it until it’s wheels fall off. Love the car.

Best explanation of Prius Hybrid Battery Pack Deterioration signs, symptoms, and solutions. Thank you for sharing!

It's extremely important for any Prius owner to understand the battery vent, and particularly so for those that own a Prius C. The Prius C doesn't have the vent intake located up high like the regular Prius. The Prius C battery vent intake is located in the forward side of the rear seat bottom on the driver's side. See your owner's manual. It's not in an ideal location as packages and so forth can block the vent. Also, being located near the floor they will pull up dust from dirty carpeting and dog hair. They do vacuum easily without disassembly if the car is kept clean and the vent is vacuumed each time along with the interior. Anyone receiving a battery hot message (or suspect that the car interior was not always kept clean) needs to remove the cover panel along the front side of the seat (just push-in the center of the round pop tabs) and remove just the panel on the driver's side. (there's two panels that at the bottom seat front) Behind the panel is a fiber vent filter and this needs to vacuumed clean to restore proper air flow to cool the battery. To reinstall the round pop tabs, push the center pin outward on the side you see when installed, insert the pop tab into the panel holes , then lock the tab in place by pushing in the pin so it's flush with the pop tab.

My 05 crapped out after 11yrs.... 155k.....Dealer quoted me 6k for new pack (said it with a straight face)....Prius forums told me to call Toyota of america.....they took all my info....called me back and said they can help me with cost by slashing the price in 1/2 twice....ending up paying 1600 for new pack. God bless Toyota.

Excellent video. Unfortunately, I have all of these issues in my 2004 Prius, including the battery cooling fan turning on when parked. In 16 years I never noticed that vent before. I thought I was missing a piece of the back seat when I heard the fan!

Got 290K on my O6' Prius and runs like a new car, I use Amsoil Full synthetic Signature series fluids in this vehicle, Engine & Transmission I occasionally once every year or two will get a bad cell, I have no problem fessing up a few bucks for this car, Best car ever!! Going to run this car till it blows up!! No leaks in this vehicle its super clean in and out looks like new. Run it!!

Great presentation on troubleshooting. My nephew owns a 2007 Prius with similar issues. Your video has given me a better understanding on what to look for...Thanks!

I liked this so much I subscribed. Thank you for the Link to the app. Thank you for the tips on were to buy the batteries as well.

Thank you so much for this. Your video was extremely easy to follow for me (i dont know much at all about vehicles). You did a fantastic job presenting this information. Awesome video! Subscribed!😊

Thank you for a most useful and well focused presentation.

You are an absolute hero - I bought my 2007 Prius as a wrecker off a towing guy for 1500 with simple cosmetic damage. The battery has been giving me hell recently and I'm guessing it's because the poor car sat in the dude's lot for a few months without any TLC. Everything that you described; the loud fan, the sluggish movement, the check lights -- IT'S ALL HAPPENING. My grandad is not at all aware of how hybrid cars work, so I'm doing what I can to learn how to fix it myself. I love this video, and I hope maybe I can ask questions later on? Thank you so much for your work!

Good video. Firstly As an engineer this is first video I have heard people talk about battery problems relating to keeping the battery cool.

My 2008 130 K he’s doing good and garage kept battery is so far great just hope I can get another five years out of it. Thanks for all the useful information I’ll keep an eye on everything

This video was great, super informative, well made and really helpful! Thank you so much!

Thanks so much. Very informative... great job!

I have 193k on my Prius, and it still charges up to green status in the Texas summer heat. It's not as often as when it cools back down, but it seems to be still charging and discharging as normal. I love this little car. Never thought I would own one. I'm not a tree hugger, and don't like the smell of my own farts. But I do like the way this little car works, Smooth and quick in everyday traffic. I romp on mine and it gets over 40mpg. I also stealth camp in it when traveling across country.

Excellent presentation. Thanks so much👍

Thanks for the awareness bro really helpful

Nice, thanks a lot for making this video!👍

Thanks for posting. I replaced two of my modules two years ago, and then follow up every year with a grid charger/reconditioner treatment in the springtime. Still running very strong, fingers crossed. One thing I found was important, and it caused me to have to disassemble and reassemble my battery the first time I rebuilt it because it still acted like it was failing with the replacement modules installed, was it is real important to clean and recondition your battery bus bars and their terminals, and also to properly torque them down to the recommended specifications. Perfect modules, etc, will still act bad if the bus bars are not torqued and conducting properly.

I think you're right about the speed of the charge and discharge. I experienced this on the old HV battery in my Prius. I had a 3rd generation battery installed on my 2nd generation prius, and this battery charges and discharges much more gradually.

Very helpful , buying before used Prius , subscribed , thumbs up

what a brilliant video, i'm thinking of buying prius and this is useful. its 2007 with 100,000 miles. for 3000 pounds uk

Hi its relay very important to know more and more of the Priuses veiicle how they fails . keep ur head up 👍

I’ve had a Prius for 10 years. Before I purchased a used Prius, I was skeptical and asked several taxi drivers. They all said their old Prius ran over 400,000 miles and never had an issue with the NiMH battery. As a matter of fact, they all swear you could transfer the battery to another car and run it another 400k miles. They only had to retired the vehicle because all the mechanical and structural parts warn out. Needless to say for the time I had it, no issues at all. Thing to keep in mind is the auxiliary battery is small and needs a bit more monitoring. IE, disconnect auxiliary battery if you’re going to store the Prius for months. Battery naturally drains in non use mode and since it’s a tiny battery, it drains faster. I understand they’ve gone to Lithium for the Prius Prime but I can say I have 100% confidence in the NiMH.

Thank you thank you! This helped me a lot. My partner’s 05 just had a reconditioned pack put in 8 months ago and that stupid Christmas tree came on. I nearly had a heart attack. It ran down quickly the night before but was holding a solid charge up until then. It only goes down to purple when we sit with the AC or loud music on for 15+ minutes. But when he normally drives it’s almost always at green and when accelerating, it maybe loses one or two bars. Never more than that. I had detailed the car and added some small interior lights and my guess is that since I let it sit with the ignition on and the ac on that I drained it so low that it tripped the system. Cleared the codes and it hasn’t done it since. I’m going to have a pro look at the cells and see if there are any failing ones and just have him install the ones I bought.

As batteries age, their internal resistance goes up, so more heat generated for a given current flow.

Your signs sound exactly like the problems I'm having on my Prius. I ordered a OBD tester and I'll get the software for the phone. Then I'll be able to see what's going on with the hybrid battery.

Thank you for sharing. This is great. Now I need to find a decent obd 2 Bluetooth scanner. This is great.

Great Video! Thanks Dude!

Very good and instructive video. Thank you

Best video out of all of them.

Thanks for sharing. Let us know how it goes. I'd be interested to see how the install goes on the new mods. And if you do the load test, that would be cool too.

Good job, man. Thanks

Prius from 04-09 are the best car for work good on gas which can't beat it... I had toyota prius 04 at 171k hybrid just goes out i luckly i can still drive to a local shop at 24mile they replace 3 module battery pack and work great thank for your video very helpfull thank..!

Note at 7:36 that the ICE stopped running yet the battery bar kept going up until 7:55, which is also a sign that the battery is failing as some of the modules voltage go up even when they are not being charged.

Awesome and helpful....thanks!

Great info, thank you.

You usually just want to replace the whole battery pack when a module OR cell goes out. You can replace one, but the others are not far off. That's if you don't see any corrosion, which you can just clean and be good.

I just had the red triangle with the exclamation point come up with check engine light and other yellow warning lights last Sunday and the AC went out along with the cruise control. Since it was Sunday many Toyota dealerships were closed. I drove two counties south to get to an open dealership and they said my Hybrid Water Pump was bad. I had them replace it and it cost me an arm and leg! They have a new building and I guess they have to recoup their investment plus it was Sunday too! This just motivates me more to invest in a scan tool and learn more about how to fix these myself! This is the first time I've had this problem so I had no idea what it was? I just bought a slow charger for my 12v battery since I've gone through 4 of them in 11 years. I just put in a replacement of a 4 year battery that lasted only 23 months. My Prius seems to eat these 12v batteries! I also invested into some new spark plugs and two torque wrenches so that when I get to 150,000 miles I'll change them out myself. The quote I got to get the plugs changed at my local Tires Plus was $150. Too rich for me!

Good video friend thanks for the information.

Hello CtrlAltDefeatTV. What obd 2 scanner did you used to check the hybrid battery with torque pro app? Thanks

Wonderful presentation

Great video, what is the App/Module that you used for checking the voltage of the Cells of the Hybrid battery?

You are so knowledgeable! Even after listening to you I know I can’t do those things. I just bought a 2008 Prius and want to take it to a dealer to check out EVERYTHING. Could you give me a list of wording to say to them so I can get it checked? I have learned just saying everything doesn’t work, to them it means minimal and I get charged the hourly fee. (That’s my Dodge dealer) BTW, I’m 72 and a lady. Usually get taken advantage of. I don’t mind paying for what I really need. I believe in maintenance .

Great work

Hello again ... greetings when changing the inverter, do you have to program? It has to be the same part number ... example my car is 2007 do I fit a 2008 Prius?

I have been learning how these nimh batteries work when they are at low capacity, its best to put the cells on a trickle charger for a straight week at 100 miliamp charge at 3 volts above cell voltage. This will de-sulfate the battery cell and then when its charged you will take a battery load tester for lead acids and load the cell down for a full minute and check the amps as it trickles down, you should see with a good cell do 100 amps and slowly fall if it does not do 100amps or base capacity put it back on the trickle charger at 200ma and redo the load test. Once the battery is fully restored it will not off gas or heat when discharging like it was before but it will only give back 80 percent of capacity. The problem faced with hybrid batteries is that they charge the center of the battery capacity and they never get a full absorption charge. So from time to time take your hybrid on a 100 mile road trip on the interstate and do some really hard driving it will refresh the cells.

May I know please which car scanner did you use for testing the 14 batteries voltage block modules (the health of the batteries) for Toyota Prius 2010.and which app is for iPhone, please.

My battery voltages all show up as 16+ volts but have code p0a80. What do I do next?

The old cells are still partially good so can they be repurposed for mabye a power wall

I just bought a 08 Prius about 2 wks ago and so far I absolutely love it...I do believe I made a wise choice

Hi, what is the app you use to monitor batteries?

NEW SUB HERE! Thank you so much, man!

oh my god. I know this is 5 years old but i hope i can still monitor my hybrid this way, i've been searching everywhere.

Thanks, bro!

if it were in california, 10 years or 150K miles on hybrid battery - it's the California law! PZEV sold in California have a mandated battery warranty period of 10 years/150,000 miles. ... **Original owners; secondary owners receive 10 year/100,000 mile warranty.Feb 22, 2016

How many miles did your Prius have when this video was made and at what mileage do the Prius batteries tend to fail?

how to get TORQUE Pro display battery voltages by module? which version of torque pro are you using? Mine does not have this information....

Great video

Please answer my question if you can. I have a 2011 Chevy Silverado 1500 hybrid I want to change 2 modules. What modules do you recommend?. I hear some shops are using new generation modules. Can I use any module?

Good video, any Bluetooth adapter would work? Even with AP200 Autel but just to have the app you mentioned? Thank you.

which scanner is that? i have one which does not show blocks on my 2005 Prius. please help me to find the right wireless scanner which can work with torque app. Thank you

I’m thinking of getting a 2010 with 110,000 miles or a corolla the only thing that concerns me with the prius is if the battery or maintenance is expensive to fix. Do you think it’s worth it?

Thanks for this video

Hello, sir thank you very much for educating us, I have a question I am bought iPhone now and want to download Troque Pro but can not find it in the apple store any suggestions, please?

Which odb2 you used I have onniva it not connecting with torque pro app.

I couldn't get Torque-Pro to grab the PIDs ("Press ENTER" (Where is Enter?) so I used Dr. Prius. Most important is Internal Resistance. That's where the blockage is. Most Prius owners don't know that if you take all 28 modules to your Toyota dealer parts dept, you can exchange for 28 New Panasonic modules for $1950. For some, this is better than playing "Whack-A-Mole".

Thanks for the video very informative, what BLUETOOTH WIRELESS ADAPTER works best for the Torque pro app? Do you have a link? TY

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Super video thanks for sharing 👍👍👍

OBD2 apps: There is no "Apple equivalent" - Apple's devices don't support the Bluetooth profile that is required. Can't use an iPhone for this (unless you have a WiFi-OBD2 dongle, but those are expensive). As for the error codes: A very low (less than 10V measured without load) 12V battery can also cause the red triangle, VSC light and other errors. Check that before you go buying HV-battery modules or have it replaced entirely (the latter is probably better in the long run).

So, I sprung $5 for Torque Pro app, added dials for my traction battery cells. There are 14 readouts, all within 1/10 volt of each other. I'm pleased as punch. '05 Prius, 110,000 miles. Original brake linings, too.

Thanks Alot ..

Thank you so much for your vidy

2012 Hyundai sonata with hybrid battery issues I check the voltage on the battery cell and the bolt is right but I'ma still wonder is the battery that is damaged or is something else? Thank you

is there a way to trigger the HV battery fan to run at all times and not when the battery temps reach around 100 degrees.

Thank you that’s helped 😊

Does the OB2 to Bluetooth unit come with the Torque pro app?

My 05 prius with 280k still runs like a clock and battery charges to green frequently. No sign of dieing any time soon!

Thanks a lot, you may have solved my recent list of weird events, like sudden triangle, power loss, etc. ! Golden video what can I say. Is it at all possible to continue to drive with a bad battery, I wonder.

THANK YOU FOR YOUR VIDEO IS WHAT CAN YOU TELL ME BLOCK 9, BEGINNING TO COUNT FROM ECU (COMPUTER OR DRIVER SIDE TO PASSENGER OR THE CONTRARY, IT OR THE POSITION OF BLOCK 9? THANK YOU

Informative presentation well presented. How many miles on the vehicle I wonder?

Be nice to see you join our" I love my prius " group on Facebook.

Hello, I have the light check on my Toyota Prius 2004, the code is P2601 : cooling pump​ control circuit range/performance, what's problem? Note: I've replaced cooling pump 3 holes, and cooling tank also. But still alert "check P2601"

At what sort of stage of use do these batteries start not performing so well ? I have just bought a 2014 Toyota Harrier Hybrid 2.5 litre with 65000kms on the clock , as Toyota covers the battery for 100,000kms im not too worried but would like to see that its still running optimally , what is the app called you use ?

This is waaay after you posted the video, but I'll give it a try... I just test drove a 2006 Prius, and the battery on the SOC screen is gray. No purple, blue, or green. And although it shows power going to/from the battery the level does not change. What is this about and how is it fixed? Is it an expensive repair? I've seen this on another car I test drove, too. TIA

Thanks Bro ..What can be done...to keep maintaining the battery?

Thank you

How long can u drive after all dash lights come on? Does hybrid battery need replacing right away or can we drive a few thousand miles?

I Installed window vents to keep the heat out in summer just leave each window down 3/8 of an inch to keep interior temperatures from reaching 120 degrees in summer!

Dear I have a prius 2006 which is used only 40k kms now it shows the triangle of death on dashboard. What is the problem behind this. The battery shows charging and discharging very quickly.??????

Corroded bus bars prove that resistance is not futile. Now I know. Thank you.

@CtrlAltDefeatTV I too have Torque Pro, how did you get it to read the individual modules voltage?

but what should the Voltage of a normal cell be during that AC on and the engine off test ? what is considered low voltage for this king of test ?

What about the gas gauge ? I have reset it numerous times and it does nothing. I have a full tank, but it says that there is none. 😞😞 that blinking light freaks me out. Help

Will two weak or bad battery packs make it stall when driving just after 5 minutes of driving? Mines a Camry hybrid

I went through most of the indicators mentioned in this video and recently bought a remanufactured battery.

Is it normal for the charge to deplete overnight? When I start mine up after letting it sit even for a few hours, it is kind of sluggish and the battery bar shows half full and depletes to one bar by the time I get to the end of my street. It charges back up as I drive after that though. Really great video, btw. Didn't realize you could monitor the batteries like that. Will have to give it a try.

I have had three or four battery *events* since I replaced a bad cell whereby, after starting the car and traveling for a few minutes, the battery drains completely within 1 or 2 *minutes* and sometimes faster. I get a warning and the car goes into gas-only mode which makes starting from a dead stop rather slow. The battery tries to charge but doesn't seem to be able to. Long story short, it appears to be related to (1) running the air conditioner and (2) only on very hot days - think 90°F (32°C) and above. If I turn off the AC, the battery begins charging again. However, the battery charges to a full charge in just a few *minutes* which is much faster than it seems that it should charge. Furthermore, after the battery is charged, if I turn on the AC, the car runs fine for the remainder of the trip. Weird. Given all that, me thimks there is a faulty sensor somewhere that is feeding the computer bad information making it *think* the battery is discharged when, in fact, it may be just fine. I have not gone to the trouble to connect a separate voltage sensor to the battery to find out what it is really doing. Not sure that I will because I have a Tesla Model Y arriving in November to replace my beloved 2005 Prius so I am not all that motivated to put a whole lot of effort into finding out what is really going on. But if I do, I will post something here.