Ping battery, Dead?

dequinox · May 5, 2020

I've not got a great sense for what is an acceptable difference in cell voltages for LiFePO4, and was hoping a battery guru could quickly weigh in on whether it's time to recycle (battery is 15 y/o... lol). I've ridden with this thing a few times over the last year without a problem, but when I put it in a wood box and tried the BMS cutoff started hitting at pretty low throttle values.

Max deltaV is 0.267 between cells 3 and 15 in the diagram below:

Hillhater · May 5, 2020

...Max deltaV is 0.267 between cells ...

That is too much for LiFePo4.
You could check for poor connections and/or try individually balancing those low voltage cells, bu i suspect you are wasting time.
After 15 yrs, i think yiu have got your moneys wirth from those. ! :wink:

dequinox · May 5, 2020

Hillhater said:
After 15 yrs, i think yiu have got your moneys wirth from those. ! :wink:

Especially since they were given to me :lol:
Again... THANK YOU PETE!

john61ct · May 6, 2020

I'll pay for shipping if you want to "recycle" them

dequinox · May 6, 2020

john61ct said:
I'll pay for shipping if you want to "recycle" them

Sensing an opportunity are we John? Seriously, batteries are 15 years old. They've been superglue/hotglue "de-puffed" as well. There's another set of 15 cells too... if you're wanting those. I would discuss shipping them all to you if you want.

john61ct · May 6, 2020

just to play with

depuffed ones never mind

In a non-propulsion context 15 years can be just barely broken in, 10,000 cycles still above 90% SoH if well coddled

assuming A123 or equivalent quality

Hillhater · May 6, 2020

....assuming A123 or equivalent quality ....

:lol: Obviously, you missed the thread title ?

john61ct · May 6, 2020

Sorry, are you saying Mr Ping does not use quality cells?

amberwolf · May 6, 2020

Dunno if the cell models used were ever listed in any of the threads about fixing them over the years
https://endless-sphere.com/forums/search.php?keywords=Ping&terms=all&author=&sc=1&sf=titleonly&sr=topics&sk=t&sd=d&st=0&ch=300&t=0&submit=Search

but there have been plenty of pics if you want to try to figure it out.

Hillhater · May 6, 2020

john61ct said:
Sorry, are you saying Mr Ping does not use quality cells?

No Need to be sorry..
I am saying that 15 yrs ago, Ping did not use A123 or equivalent cells.
He used cheap cells.!

LeftieBiker · May 6, 2020

I have a 6 year old Ping Pack, hand-made by Mr. Ping, and a 5 year old Ping Pack, made after he sold the business but still worked there. The older pack is in amazing shape - almost like new - and the younger, five year old pack is in about the shape you'd expect a three year old pack to be. No complaints from me, except maybe that the newer pack has a larger vampire drain from the BMS.

john61ct · May 7, 2020

Hillhater said:
I am saying that 15 yrs ago, Ping did not use A123 or equivalent cells.
He used cheap cells.!

Wow, interesting!

Maybe I should drop my standards and try them then!

Any feedback on the relative merits of

K2

Headway

VariCore (same as Vbatty same as Liitokala?)

Queen

Goldencell (same as Heter/ENERpower, also Full River?)

Not looking for high C-rates but energy density, and longevity most of all

dequinox · May 8, 2020

john61ct said:
just to play with
depuffed ones never mind ...

Yeah I'm not sure it'd be worth it even for you just to mess with. They are a bear to desolder.

Ping battery, Dead?

dequinox

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Hillhater

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dequinox

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john61ct

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dequinox

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john61ct

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Hillhater

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john61ct

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amberwolf

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