Is there a range of time these batteries can sit idle without activity and survive?

Thanks again!

 

On newer/lower mileage packs, it shouldn't matter a lot. It's actually very common for brand new packs to have modules > 6 months old.

Sitting the least amount of time possible is best, but I wouldn't get too hung up on it. When you receive the pack, the voltages should barely deviate within a pack...±.01V

 

What's your opinion on a 2016 Prius C battery with 167 total miles? This is kind of a unicorn as it is in a crash test car. My gut feeling is that it has sat way to long, but curious your thoughts.

I also found a 2014 with 43,000 miles.

I am still looking for newer options. Just getting started.

 

Probably too long.

2014/43K is a good match.

Last time I did this for a GS450H pack (40 modules), I found 2X 2016 with about about 20K miles (a little over 3 years ago). The battery outlasted the car.

 

What is the normal operating range for SOC with a good battery?

 

I don't know on the GMs. I haven't seen enough of them to run them through their full paces. They should operate mostly around 50% SoC with only minor deviations above and below that except when extended coasting, extended uphill climbs and heavy A/C use.

From here:

https://electricvehicleforums.com/fo...iles-p0-32286/

A severely degraded battery won't discharge nearly as low (55% in this one).

Whereas a new battery went down to 43% before it force-charged.

 

S Keith,

Could I mix modules from a 2019 11K miles with a 2015 40K Miles or is that asking for trouble? I also found a 2018 with 43K just need to drive further. I found another 2019 but it's pretty far away for me and they don't ship.

Or would it be better to have 2x 2015 40K and 72K miles?

Thanks!
.

 

"asking for trouble" is strong wording.

I would prefer the 2015+2018 both with ~40K miles if there's a meaningful cost savings.

IF you go the 2019/11K + 2015/40K combo, use the 2019 to build the MIDDLE of the pack, i.e., modules 11-30 measured from either end and then the 40K pack for positions 1-10 and 31-40.

When procuring packs, remove the cover and inspect the serial numbers. The first 4 digits will be identical representing DDMY followed by a bunch of alphanumeric digits. The LAST digit will always be alpha, and it should be the same for all modules within a pack.
DD=01-31
M is 1-9, X, Y, Z
F = 2004, G = 2005, etc.

Example:
28YF = 28th of Nov, 2004.

Note that while I said they're identical, on rare occasions, they may vary by up to 3 months with a pack. In many cases, the last 4 numeric digits will be sequential or nearly so.

For the given manufacture date of a vehicle, the modules are typically made 0-6 months before the manufacture date. You can look up manufacture dates by VIN.

Measure all 20 voltages. In most cases, they will be 7.XX identical, but may measure ±.01V. Reject any pack that shows evidence of tampering.

 

45 days is the limit for refurbished ones then it's warranty voided..

NiMH will can sit like 10 years without discharging ( low or high temps might damage the battery)they will need some power added like once a year to retain performance

 

False on all three counts.

Refurbished periods vary by builder.

I've seen NIB NiMH fail in self discharge after < 10 years.

They will not "need some power added like once a year." They merely need to be driven to restore performance.