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Old 12-27-2009, 09:47 AM   #40 (permalink)
Engineering first
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Join Date: Mar 2009
Location: Huntsville, AL
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14 i3-REx - '14 BMW i3-REx
Last 3: 45.67 mpg (US)

17 Prime Plus - '17 Toyota Prius Prime Plus
90 day: 58.25 mpg (US)
Thanks: 73
Thanked 189 Times in 121 Posts
First I want to thank you for this work. It is grassroots efforts like yours, AutoBeYours and other independent shops that we develop a sensible, sane, USA capacity to keep these vehicles running.

Originally Posted by hybriddriveguy View Post
. . .
We will make these available on our website soon at Remanufactured Hybrid Vehicle Battery Packs
I will try to follow this thread and answer any other questions anyone has or please feel free to contact me directly.
A little off topic but I wanted to ask if you think the older, NHW11 modules are worth refurbishing?

Near as I can tell the "O" ring around the B+ terminal deteriorates, probably from heat, and this allows out-gassing and loss of water from the electrolyte. Although distilled water can be added to these modules and their original capacity returned, I've not found a practical way to reseal the B+ terminal. The Toyota 'sealing' gunk does not impress me. Do you see a practical way to seal the B+ terminals of the older NHW11 modules?

What sort of Ahr capacity are you finding in the NHW20 modules when they come in?

Does discharge-charge cycling restore capacity in the NHW20 modules?

The reason I ask is I do not see a restoration of capacity to the NHW11 modules without adding water. But once the electrolyte is rehydrated, cycling the older modules brings their capacity back (actually a little more than 6.5 Ahr.)

If you have some low capacity, NHW20 modules that defy restoration of capacity, not dead cell but lost capacity, I would be interested in getting some for refurbishment experimentation.

One pattern I'd noticed at "Prius Technical Stuff" is a tendency for traction battery failures to occur in hilly and hot areas. Have you noticed any service area patterns from customers with failed traction batteries?

Bob Wilson
2019 Std. Range Plus Model 3 - 134 MPG3 || 2014 BMW i3-REx - 117 MPGe, 39 MPG
JuiceBox 40 Pro (240 VAC, 40 A), KHONS portable (120-240 VAC, 12-32 A)
Retired engineer, Huntsville, AL (five times AutoPilot saved.)
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