Why not to try revive abused cells!

Batteries, Chargers, and Battery Management Systems.
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sketchism   100 W

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Why not to try revive abused cells!

Post by sketchism » Aug 16 2018 8:26pm

My neighbour borrowed one of my 'in progress' bikes while i was away, before it was finished, rideable but not finished, no LVC set and nothing calibrated.

I got a msg saying the bike is dead and wont ride anymore, i asked what voltage the CA says and he said 40v... it was a 96v pack

The cells that recovered at all were sitting around 2v and i threw out the ones that didnt bounce back at all and tried to gently balance those higher packs up over a few days, and half of them held charge and seemed ok, they even did 3-5 cycles no problems... until this

This is definitely NOT the batteries fault, but a great lesson as to why not to try 'recover' undercharged and abused cells

https://hubsink.com/blogs/news/undercha ... recharging
Don't overheat your ebike hub motor - www.hubsink.com (beta testing still open)
https://hubsink.com HubSink - Hub Motor Heatsinks

https://australiandroneco.com Australian Drone Co - Aerial Videography

Nothing is fool proof to a sufficiently talented fool, trust me we'll find a way :idea:

Joachim   1 kW

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Re: Why not to try revive abused cells!

Post by Joachim » Aug 17 2018 3:27am

:shock: lucky the packs not stay on the bike :o

EbikeAus   100 W

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Re: Why not to try revive abused cells!

Post by EbikeAus » Aug 17 2018 3:43am

sketchism wrote:
Aug 16 2018 8:26pm
My neighbour borrowed one of my 'in progress' bikes while i was away, before it was finished, rideable but not finished, no LVC set and nothing calibrated.

I got a msg saying the bike is dead and wont ride anymore, i asked what voltage the CA says and he said 40v... it was a 96v pack

The cells that recovered at all were sitting around 2v and i threw out the ones that didnt bounce back at all and tried to gently balance those higher packs up over a few days, and half of them held charge and seemed ok, they even did 3-5 cycles no problems... until this

This is definitely NOT the batteries fault, but a great lesson as to why not to try 'recover' undercharged and abused cells

https://hubsink.com/blogs/news/undercha ... recharging
What type of cells are they?
Choose LiFe 8)

May all your batteries be fully charged and perfectly balanced :P

Philaphlous   1 kW

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Re: Why not to try revive abused cells!

Post by Philaphlous » Aug 17 2018 7:24am

Did I miss something? Until this........nothing?

sketchism   100 W

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Joined: Feb 17 2016 8:35am
Location: GC, Australia

Re: Why not to try revive abused cells!

Post by sketchism » Aug 22 2018 6:46pm

haha yeah lucky i heard it making expanding noises, like a creaky chair
Don't overheat your ebike hub motor - www.hubsink.com (beta testing still open)
https://hubsink.com HubSink - Hub Motor Heatsinks

https://australiandroneco.com Australian Drone Co - Aerial Videography

Nothing is fool proof to a sufficiently talented fool, trust me we'll find a way :idea:

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fechter   100 GW

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Re: Why not to try revive abused cells!

Post by fechter » Aug 22 2018 9:25pm

Great picture.

Yeah, what kind of cells were those? I want to know so I don't get any.
"One test is worth a thousand opinions"

Syonyk   10 kW

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Re: Why not to try revive abused cells!

Post by Syonyk » Aug 23 2018 4:45pm

Yup. I won't touch anything below about 2V, and that's only if I know exactly how it got there and how long it's been there. Below 2.5V with unknown history, nope. And LVC on most of my stuff is 3.0V.
Battery packs, Sunkko Welders, and more. http://syonyk.blogspot.com/

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thunderheart   100 W

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Re: Why not to try revive abused cells!

Post by thunderheart » Aug 24 2018 2:39pm

Why not to try revive abused cells!
An important mention - Lipo cells.
And they can explode even if you never abuse them.
Buy normal cylindrical Li-ion cells or LTO and enjoy the life ;)
Yinlong LTO Lithium Titanate safety tests: https://youtu.be/eAUYbSDEy6I
Toshiba SCiB LTO Lithium Titanate safety tests:https://youtu.be/XsrRDZxEFQE

LG M50 vs Samsung 48G:https://youtu.be/KGJDogOG4zw
LiFePO4: QB26650 2500mAh 50A vs A123 ANR26650M1B: https://youtu.be/GOSkte11lRc

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