for those that might be having the same problem i had - not being able to read the capacity at the end of cycles except the last cycle - i found the trick! on the screen after the cycle stops, there are two buttons at the bottom. the button on the bottom left is 'ESC', to go out to next higher menu. the one on the bottom right is 'Graph' to show you a (pretty useless) graph. between the two buttons is the word 'CYCLE' (if you're cycling as H-EV Tech describes). the trick is that if you click on the word 'CYCLE', you get a screen with the data from the cycles. it doesn't look like a button, but it acts like a button. the data from the cycles shows max charging mAhr and discharging mAhr for each cycle.

Very good breakdown! Loved that you included a spreadsheet layout, not many go into such detail in this area. Thanks a bunch!

Dude thank you! I can't tell you how much this video helped me!

Thanks for the info man, about to rebuild my battery off my 3rd Gen 2012 Prius. Been noticing that the MPG has been tanking sharply especially over the last 3 months. Had done cleaning on my cooling fan 2 months ago though I am yet to deep clean those nasty bus bars which I doubt have ever been cleaned since the vehicle rolled off the factory floor. Maybe this will help though I am looking forward to also balancing the modules to get a true picture of the true life expectancy of the battery. Loving your content from Nairobi- KENYA

Thankyou so much!!! I just completed this job w the tenergy 180 per your suggestion Only trouble was the orange safety plug at the end (ty priuschat forum) Your videos gave me all the necessary details to complete the job! Thankyou so much

Nice job ! I have not seen any other video like this. I now Definitely understand much better how to balance a battery pack. Thanks. Subscribed

Thank you so much! I learned so much. I just did the battery in my camry. I started with Dr. Hybrid app with LET of 32.68% And with your help the LET is 77.02%!!! Thank you so much!

8:35, instead of stripping an audio wire or using solder, another option is to get a section of common electric wire used in home 110V networks. There are 3 solid copper wires in each of those wirings, and it is very easy to strip one with a utility knife. Or just cut a wire long enough to use the exposed ground wire inside w/o strip any black or white lines.

i followed the process H-EV Tech outlined in this 3 part video series and it worked for me. my prius had 240k miles on it and i got the red triangle of death. i had the p0A80 error code. that was back in late june. it took about a month of elapsed time to get it back on the road using the process outlined in these videos (i only bought one tenergy unit). the car has been back on the road now since early august and it's doing ok. mileage had dropped to less than 35 mpg before the red triangle; now it's back up to 40 (after a reset). i had many modules that had low capacity. i ended up shooting for 4000mAhr as the 'bar' to get above. i replaced two modules and just reconditioned the other 26. i would cycle until i got above 4000 and i would punt if 5 cycles didn't get above 4000. some were much better, e.g. 5000, but many ended up just a little bit above 4000. i don't know how long the whole thing will last - we'll see. i did the step where you bring them all to the same voltage by tying them all together in parallel. i used romex 12ga wire for that, happened to have some in the basement. i also followed the balancing step (where you pair modules to get similar capacity for each pair of two modules). thanks H-EV Tech! my prius would be toast without your videos!

Great video, thank you!

Thanks for showing your balancing method, I was wondering how to do that. Great video!

Haha THANK YOU! I see one answer just below my text. I'd better read more comments! I was seriously thinking of returning this charger.The guys Q 3x whatever seems easier!

I really like the way you reconditioned your Toyota Prius hybrid batteries. I am trying to follow your process to recondition my Lexus RX400h and I am ordering the same charger that you used on the video. My individual cell has a voltage about 10.4 V and I just wonder if you can recommend how I can set up the voltage and current for charging and discharging. Thanks

great video - thanks very much, H-EV Tech! i just started trying to recondition my HV prius battery. it's a 2006 with 240,000 miles on it and i got the triangle of death. i'm not sure yet how many modules i'll have to replace (only one had failing open circuit voltage, but others may have bad capacity; we'll see). i'm following the method you outline - really appreciate your detailed explanation! i'm not sure i'm following the method you used correctly. i set up the t180 as you described, with charge and discharge currents 5A each. but often the discharge current the display shows is more like 2 or 2.5A. am i doing something wrong, or does the t180 vary the discharge current for some reason? (i'm using kind of cheap alligator clips to connect to the module and there is ~1v of loss in the clip wires - will that confuse the t180 and cause it to use less discharge current?). i originally setup to do 3 cycles at a time (3T), but when the 3 cycles were over, i couldn't find any way to read the discharge capacity after the first or second cycle - there was no data anywhere i could find. is there a trick or a special menu to read out the discharge capacity of each cycle?

Great video👍🏽 got the same charger because of your suggestion I had originally physically balanced all the cells before balance charging which I followed to the letter by your direction, had a few minutes to figure out how to start it 🤪 you have to hold the button down for a few seconds/ I haven't gone so graphed detail as you have and I'm using written notes instead but I will keep you updated if that's ok ? Since I'm only on the first one ☝🏻 thank you 🙏🏽 so much again

Great info! Thank you

Great job done

I just finished cycling each individual battery cell. now I’m about to do the battery as a pack. But what settings did you use for capacity and Delta Peak.? Thank you for your help

This series of videos have been so helpful to me in Reconditioning my battery pack! Thank you so much for taking the time to post this for us!! I do have one very important question just so I don’t mess anything up. Are there exact settings when charging all the modules together? I have followed every step and I have arranged them all and am now trying to figure out the settings you used when charging them at the end. I understand you charged them at 1 amp but I’m not sure what capacity and the other settings to use. Thanks so much again!

Thanks, good video !! At the moment i have my Lexus GS450H batterypack at of the car. 1 defect modul. I measured the capacity of the other modules and find 9 additional weak modules. The rest have a capacity from 3512 to 5155 mA/h. Do you think it makes sence to pair this modules in blocks to have a runing battery with lower capacity?

The prius techs says you should do Dcharge/charge this is very important step.

Great Video!

After you charged/discharged the cells, what voltage did you bring each cell up to to balance the pack?

Great video. How do we know that it would be save to discharge at 5 amps and charge at 5 amps individual modules?

Thanks for this informative video. It was extremely helpful to give me the courage to work on our vehicle myself. I received the red triangle just days after buying our 2004 Prius. When I opened the cover, I discovered that 5 of the modules are smaller. All modules test 7.99-8.01, even the smaller ones. I assume that the problem is the 5 irregular-sized modules. I plan to replace those 5. Does that sound like a good solution?

Thank you👍

So when you said you balanced them and wrapped the sodor wire to each cell at + and - parallel, did you hook up the t-energy to the end wire and trickle charge at 0.1-1.4 amps to obtain a balanced total charge of 7.6 or something and then let it sit for 16 hours before plugging in back in car? Thoughts please? I did receive to eBay batteries higher than the rest...8.10 and the others are 8.05....what do you think?

After you balanced the pack what did you set the charger voltage to charge the whole pack? What voltage in the end did each cell test at?

I have 2 of the the same Tenergy T100 chargers. They charge at different rates and maximums even though they are set exactly the same. I have reviewed the factory settings for Charge and Discharge- they are the same. Any ideas why and how to fix? Thanks for the great tutorials.

hello , great video first of all !!!! do you charge the cells before start doing the test ? or does that machine does it for you basically? also how long should i leave the battery balancing after the cycles, thank you very much

Nice video!

Im new to hybrids and pack 8 in mt 08 prius is bad. I got the dealer i bought the car from to give me 18 modules to try to charge/discharge them. I bought the T180. Check voltage on these and most of them are at 7.4. Im charging/discharging each one 5t now to see if they are good. I thank you for your videos, huge help. What are the settings on the T180 do you set when balancing the block? Im an aircraft mechanic so im just going to use safety wire when I balance them.

I have a question when you do Charge - Dischrage do you charge it again to finally put it in the car or leave it discharged? and I saw the balancing video when you connect all Positive and Negative do you attach it to T180 or does by itself and how long do you do it. can you please explain the process?

I’ve never worked on battery before- what are the charging settings when I am balancing?

What did you use as a cut-off voltage for discharge? You said you established 4000 as your discharge mah threshold, is that based on 80% of max? Thanks!

Would you happen to have the spreadsheet that you used available. Would you be able to share it. I like the way you are drilling down to diagnose and repair the battery. Thanks

Hi what setting you used to charge the complete pack at once

How do I check the cells current mAH before I do a cycle on it? So I can record the before and after results? I also bought the T180

This is good because it shows in detail how you had the settings.. My question is that if I did two modules at a time I would double the voltage for charging but would I also double the capacity from 6500 to 13000?

t180 on your video on cycle setting was discharge end volt at 6.3v. Did it intelligently reach the max 8.x volt and cycle back down to 6.3v? Or you set max voltage somewhere? Also 5A took you how long per cycle?

Hello, for hybrid or nimh batteries to work for many years, they require passive and permanent balancing due to their low cell tension, they will not be the same. This is solved by connecting a shunt zener diode with its current limiting resistor. It balances all the cells at the same voltage. It is not perfect and a small percentage of capacity is lost, but it is better than a dead battery after 3 years. This method is highly effective, reliable and easy to integrate, achieving triple the useful life of a battery.

Hello. I recently replaced 2 cells in a bad block. (one of the cells had actually blown). The Dr prius app recognized it as block #9 was bad. It was kicking the red triangle and throwing the transmission into limp mode. Because I was short on time I simply replaced the 2 in the bad block. The car no longer goes into limp mode. Now it says block 8 unbalanced and still gives the red triangle, but does not disable anything like before. Would looping like you mention here and running the cycles help balance out the pack until I can more extensively recondition each cell?

I'm currently trying to apply this process to my HAH batteries which come in sticks of 12 D cells, for a nominal voltage of 14.4V. When I set the current limit to be 5500mAh (the tested value of the cells I plan to replace bad sticks with) the charger just kept going. It also brought the voltage all the way up to 18V. Do you think that's normal?

I ended up using solder too because I didn't wanna splyce some wire as well. That's crazy. I put the batteries in seres as well and they seemed to balance out in just a few minutes. Are you sure they have to be balanced for hours? My multimeter had them all at the same volt but of course it balanced to the voltage of the weakest battery.

thank you so much! i ve got a question is it better to make discharge->charge cycles then charge->discharge? and is it okay that with the settings as you did when charging it goes to 9,5V? you said that this modules dont like to be overcharged thank you and i hope you ll answer)

What is the set up to charge the whole pack

Is it necessary to discharged the block battery and put it in the cycle If the battery power is very low and is near to maximum discharging?

When balancing (solder wire) or anytime when more than 1 module is linked to another, are you wearing linesman gloves?

Thanks a lot for the great video! It is informative and somehow very entertaining! I enjoyed watching it! I have one question: After cycling, you ended up with each module being discharged am I correct? (because it's a Charge/Discharge Cycle)... Did you then completely charge the whole thing when in parallel? Or did you charge each module individually to their final capacity and then go for one more charge in parallel at 1A for a couple of hours? Thanks in advance for the engagement

What settings did you use on tenergy charger to charge the whole pack? Thank you

How can I see my modules condition from original condition (before charge them) and after process?

How you set the charger when you charge the all and how long you put it

After the 3er cycle what is the lowest voltage and MAH to keep a cell

I ordered 2 of the T180 chargers and plan to refresh a spare pack I got from a wrecked Prius. I own 3 gen3 cars and want to have a pack ready to go in case of failure. I did not see in the video how you calculated the discharge capacity. Does the charger provide this info at the end of the each cycle?

Did you do each cell individually or did you do a series of cells per time

When I was charging my modules, using the same settings as you had for the T180, other than swapping the discharge/charge order, a lot of my batteries ending mAH were up around 7200, some even going about around 8200 mah even though it was set o charge up to 6500. Is this normal? If not, how much am I risking damaging my modules?

Do you think you would get decent result by simply replacing the low voltage cells?

Great detail! Thanks for sharing man! I have a Turnigy Reaktor that I think can perform close to the same and will read into the details I can set for the Cycling process. Wondering if you used the Internal Resistance function on your charger for any of the cells to compare as my understanding balancing that is important as well, though maybe is related to the charge cycle and capacity in relation to same voltages since that makes sense I think as well? Please detail your thoughts and experience if you can please. Very curious to know. Thanks again for sharing, man great detail.

What mode and settings did you use on the T180 for charging the whole pack together in the last step of cell balancing? Was it the power supply mode?

When you balance it, what watt do you set it to charge all the Modules? I would appreciate it if you answer this question.

thanks for video i have 2005 Prius with p0A80 and cell number10 low. l removed the battery and all of them are 9.61>9.71.performed the load test and the hold the voltage .I bought it used and i am driving it for about a year and this just happened. i don't know why it is so high.(voltage). . i thought if it has internal short it would not pass the load test but it did. can you help me with it thanks

Thanks very good video, but could you explain how to balance the battery pack, step by step.

Hi, how did you come to the conclusion that 5A was a safe discharge current? I would love to go this route, but others seem to be using 1A rate. Thanks!!

Does our T 180s show the high mah and low mah for ea cycle? I dont think so. Also I dont see it showing my 3 cycles.? Maybe 240min. Cut off should be increased alot. Also looks like it charges at a min.of 10V? Looks like wed want no more than 8 Volts? Thanks. On my 3rd module now.

On the Amazon Prime description of the T-180, it says “ NOT Intended for charging/discharging PRIUS battery.”

How long would a solution like this last you think ? Just curious

Pairing a module with the highest capacity with a module with the lowest capacity is NOT a good approach. I tried this, and experienced both overheating of the pack and also got the triangle. I paired the modules based on capacity, and the paired pack is lasting for more than a year. I have tried several strategies, but I have found the following works the best. I charge an individual module up to 8.26 volts @ 3 amps. I then discharge the module using a single headlight (which is about 2.5 amps), and I track how many minutes and seconds it takes to get down to 7.0 volts. I have found this is a good range to test.

I purchased the T180 and during the Discharge I selected 5 Amps, and it only discharged at 2.6Amps. I called Tenergy and they said this discharge wattage was held at 20Watts, Not the 100Watt Charge Power. Were you able to get a higher Load with the T 180 somehow?

How many volt do you charge ?you connected all - module together and + one togother. How many volt for all 28 modul you charge? How many amp for all?

Hi! Great overview of balance charging and love the spreadsheet. I just got a couple T180s to do the same thing- when/where do they display the capacity data from each cycle that you entered into the sheet?

My t180 shows cycle times on a 2nd screen accessed by pressing "cycle" button and scrolling up and down. Charge mah is 4500 and discharge 4800 Which is my mah for that cycle if I'm going to determine condition of the module?

any particular vendor you guys are getting replacement cells from ? I got 6 from a vendor on ebay only 4 could be restored to greater than 5k . another ebay vendor I got 14, only was able to restore 6.

What were the settings for the tenergy when you did the load balance step?

Do you have a video that shows how to put the bus bars back on safely and hook the battery back up in the car safely?

Hello, help please. I reach "capacity" set up on my chargers so it wouldn't continue with cycles. What does that mean?

Will these steps apply to gen 3 Prius?

I purchased the T180 charger that you are using in the video. When using it on the battery block from a 09 prius, it keeps going into "delay" and doesnt complete cycle. THis was using the settings in your video. I could really use your help!!!

All of your videos are great. I have a question for you? About how long would it take to rebalance every module, including six new modules. I'm sure you don't know exact, but could you give me a rough estimate so I know if I should take off some time from work

Will the trnergy TB6-ab smaller charger work also.

Thanks for great explanation, followed the process and I seem to get good results. How do you get capacity results for every single cycle when you have set to 3 or 5? All I get is the very last result when it's done and doesn't show me previous cycles. Unless I do one cycle at a time and record the results

Q: when you hooked up all the modules in parallel (plus to plus, neg to neg) - the last step before reassembly - why did you trickle charge at 1A? I ask because I've read others who simply let the pack sit 24 hours in this 'parallel' state, and found the pack adjusted each module to be the same. (This step assumes that the modules have been reconditioned and charged to within .05v of each other first...)

How long did the typical 5X cycling take with the Tenergy T180? I had a Gen 2 which had battery failures 3 times (200K, 224K, then 330K). Between the 224K & 330K the battery was balanced and cycled by someone else, which made a huge difference. I now have a Gen 3 at 200K and planning to prepare a spare this spring. I just assumed I can do 1 cell per day over 1 month. BTW, I am located in KC area (Overland Park) if you ever wanted to get really nerdy, would be cool to meet up.

How long is five cycles per cell supposed to take? Mine are taking upwards of 6 hours each.

Thanks for the video. How can i set the b6 charger to charge at 7-8 watts for 8 hrs I'm in the balancing phase.

How long did each tenergy model take in general tor a module? Can you post the spreadsheet? Gen1, 182k, p3030

I'm watching this again and I see what you did here with so incredible... But how long did it take you to do this whole project? Even with three chargers it must have taken you more than a week..

Where do you read the discharge capacity on the charger. I don't get any where close to the 4000-5000 range. Ill get in the 300-500 range. Im using the same parameters that your using. Are my batteries that bad? Or am I doing something wrong. Please let me know. Thanks

hello thank you for all the videos ,I need your opinion on Prolong charger it recondition the battery while its installed in the car it have some good reviews and bad reviews since you owned many Toyota Prius did you use this charger or know anything about it .this is the place where it sold Hybrid automotive prolong charger

How many cells can it discharge charge and balance?

Hi what setting did you used to charge the complete pack after putting native and positive on opposite sides

Hey- so I have those smaller t6b chargers- 2 of them… should I return them?

Hey how come you didn't do an internal resistance test?

Just did some cycles on modules using the T180, however I have set the discharge end voltage to 6v, but when the 3 cycles complete and I’m scrolling through the results, I’m seeing discharge capacities of 2400mah and a voltage of 7.6v, with slight variations for the other cycles. Shouldn’t the voltage be 6v, since that’s what I set it to cut off at? What would cause the module to prematurely stop the discharge cycle before it reaches the 6v cut off?

Hi thank you for creating this series! Question for you. I am using the t180 and following this same procedure however my batteries are all 7.4 volts to start and the t180 cycle for nimh is pushing them up over 8v in the cycle. Did you experience this as well?

To add to my prior comment, it shows on the stage "stand by" and i have tried on multiple blocks

great job. I learned allot.

What setting did you use when you were charging the whole pack with the tenergy at the very end?

Great video and it insiped me to try to repair my 2007 Prius. I bought the T180 and I am using it to cycle charge>Discharge on my 7.5v 6500mHh battery, I first ran a Discharge only on the existing 7.5xvolt charge to see where to start, however, I am concerned because it charged and now discharging the display shows the voltage over 8.85v and the mHh capacity continues to count and is now 6150. I assume it will stop at 6500 as that is where I set the limit but will it damage the battery at 9V ? Maybe it is just a display thing but it has me worried. Help please explain!

I just purchased a T180 and the instructions say "Not for Prius Battery". Do you know why they would say that?

Great video. I have one question. Does reconditioning your battery lower the internal resistance of the cells? I have 3 blocks at 30mohms and the rest are either 28 or 29. I'm trying to figure out if it makes sense to recondition or if I need to replace the whole battery.