How To Properly Repair A High Voltage Nickel Metal Hydride (NiMH) Battery Pack For Hybrid Vehicles

Another great video from The Hybrid Guy. In this video we show and describe how to properly rebuild and recondition a nickel metal hydride high voltage traction battery. The process is similar between Toyota, Honda, Ford, Chevrolet, Nissan and more.
This video uses professional reconditioning equipment, what is discussed and talked about is from the perspective of The Hybrid Guy who has rebuilt and reconditioned multiple high voltage battery packs.
Results vary according to your own testing and diagnostic capabilities.
Timeline:
0:00 - Hybrid Guy Intro Page
0:04 - What this video is about
0:52 - Hybrid Guy Intro Music
1:07 - Hybrid Battery Myths
2:34 - Terminology
3:20 - Overview process
5:20 - Tests I perform when rebuilding
12:27 - Understanding my notes
14:12 - What reconditioning does to the battery
18:26 - Starting your process
20:20 - Removing bus bars and nuts from pack / Resting voltage check
21:04 - Explaining how I use my DVOM/DMM
22:00 - Explaining findings from resting voltage check
23:56 - Preparing module testers for further testing internal resistance and voltage drop
24:35 - IR and VD explanation from notes
33:25 - Starting the reconditioning process first charge
35:15 - Hybrid Automotive cut off charge chart.
36:25 - Final result
38:19 - Test drive and DR. Prius data
41:00 - Outro
Tools: As an Amazon Associate I earn from qualifying purchases
Fluke 88-5 Kit - amzn.to/3UDXmTG
Tekton 1/4" in-lb torque wrench - amzn.to/49eg1ts
Bus Bars and Nuts - amzn.to/498W5s2
Makita 18V Impact driver: amzn.to/3D4mkBv
Prolong Module Tester - hybridautomotive.com?aff=2
Automotive pick set - amzn.to/49yeluN
Socket Set - amzn.to/4bCDt5f
OR if you want to skip the "hard stuff" and get straight to upgrading your battery, it is time to "go lithium" and get your upgrade here: projectlithium.com/?ref=e9JRo
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Disclaimer:
Due to factors beyond the control of The Hybrid Guy, I cannot guarantee against improper use or unauthorized modifications of this information. The Hybrid Guy, assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. The Hybrid Guy, recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of The Hybrid Guy, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not The Hybrid Guy.

[@Enzo-xi2cm]

Incredible we get all this knowledge for free thank you!

[@TheHybridGuy]

Happy to help.

[@Codelyoko281]

So been doing some research since my my mileage has dropped down to 34 MPG but no code . Notice that Dr Prius ( on the middle of the pack) reads 30 as an internal resistance. Is it as accurate as it seems ?
My voltage dif is never over .07 always under 10 for sure .
And was looking at the prolong delux charger to recondition the whole pack. Thoughts ? Should I try and learn and save the pack or buy a whole pack ?
Thank you for your time and this awesome video

[@TheHybridGuy]

Best is always replace whole pack. Best value for dollar over lifespan of the car.

[@briansilva9120]

What is a acceptable resistance ?

[@TheHybridGuy]

Less 25 milliohms, 25 is higher than I like but if voltage drop is less than 1v it will work for awhile and probably recondition ok.

[@dc5duben96]

what does it mean when a module has high resistance like ex 36ohms & can they be saved?

[@TheHybridGuy]

36 milliohms is really high resistance on a module. you would need to cycle it and see how much it decreases to know if it can be saved or not. I would probably toss it and find better ones.

[@dc5duben96]

@@TheHybridGuy thanks for the reply, but what do u mean by cycle it?

[@TheHybridGuy]

@@dc5duben96fully charge and balance, then drop the voltage, and repeat this process like i show in the video.

[@dc5duben96]

@@TheHybridGuy got chu, i might consider getting a charger then