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How to enable charge or discharge mode on battery?

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ArieKanarie
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(@ariekanarie)
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Hello,

I recently acquired a 43Ah battery for cheap and wanted to use it for some other project than using it in a super soco, but I cannot charge it or discharge it.

Looking at the forum @curliboy made I have the Gen1 connector with round pins.

Being able to charge and discharge it with the current BMS would be great because otherwise I would have to get another one.

Could someone give me a hint?

IMG 20211028 192452
IMG 20211028 192443

 

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NickPD99
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Make sure that the battery isn’t in safe mode before you do anything else. It’s a possibility that it lost its charge before it came to you. If you have access to a volt meter   Test the voltage it should be over 62V. 

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ArieKanarie
(@ariekanarie)
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Posted by: @nickpd99

Make sure that the battery isn’t in safe mode before you do anything else. It’s a possibility that it lost its charge before it came to you. If you have access to a volt meter   Test the voltage it should be over 62V. 

The battery is at 70V, but drops to 0.05V as soon as I attach my capacity tester (or any load)

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flyingelectric
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Easy

The two large round connectors are positive and negative. There you can charge and discharge the battery from

Be sure to double check and tripple check and use a voltmeter as well as maybe an original round connector and use the thickest wire to do your setup.

The small wires are used to give current % of charge to the bike display screen only as far as I know.

Good luck

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ArieKanarie
(@ariekanarie)
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Posts: 8
Posted by: @flyingelectric

Easy

The two large round connectors are positive and negative. There you can charge and discharge the battery from

Be sure to double check and tripple check and use a voltmeter as well as maybe an original round connector and use the thickest wire to do your setup.

The small wires are used to give current % of charge to the bike display screen only as far as I know.

Good luck

This is not the case. As soon as I hook up a capacity tester or any other load the BMS shuts off the output.

I also cannot charge the battery further than its current voltage/%

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flyingelectric
(@flyingelectric)
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@ariekanarie 

Is this a TC-max battery or one of the larger Super Soco batteries?

A TC-max battery costs 2500 euros.

Did you get a battery for cheap? Then what does that mean. Too cheap?

Maybe the battery is broken - for example if one of the cell groups are out of value 0 volt then then the BMS might turn off the output and also if one cell group is charged to 4,2v then the battery will not taking any more charge.

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ArieKanarie
(@ariekanarie)
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@flyingelectric 

I don't know which bike it came from, I paid €90 for it (someone I know paid €50 for it with pickup).

The guy had several for sale.

 

If one group is at 0, there's no way the battery can reach 70V.

Do you have a similar (gen1) battery? Can you (dis)charge with only the 2 main pins?

If there's no way to use the battery like this I will take it apart and use the batteries in a different configuration. I will probably spotweld it into a 10S, 12S or 20S config.

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flyingelectric
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0% soc would be 3v on the group. If a bms se this it will turn off in my experience not giving any voltage at all or lower voltage than main if measured.

No. I don't have any battery. Last thing I would try is to remove the connector and then manually test discharge from XT60 connector easily accessible these from experience from my old TS battery.

If not then I would use it for anything else and rebuild as you said but toss away those cells not in the same voltage range as the others. Like if one group is 3.8v and all the rest 4,15v I would toss away all in the low voltage group as bad cells.

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ElectroChris
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Its not a TC Max battery as they are 72v nominal and the pictures show this one is 60v, possibly from a CUX.

When you connect something how quickly does it shut off the load, could it be shutting down due to your tester trying to pull to many amps, not sure on that battery but I think the TC batteries shut off if you try to pull more than about 45amps from them, and the specs for the CUX seem to be about the same.

It could possibly be that the battery needs to be able to speak to the ECU but I thought the traffic was just one way from the battery to report its SOC etc.

It does seem to have been sold very cheap, possibly fallen off the back of a truck 😉 or could be a batch of failed ones.

70v sounds about right for a fully charged battery which is why you wont be able to charge it anymore, and if voltage goes back up to 70v after a while from being at .5v to me it would sound like the cells are ok and its the BMS going into shutdown as from what Ive seen with batteries in the past where they had failed you could charge them up to full voltage but when you tried to use them the voltage would drop but it would stay dropped until you tried charging it again.

Theres a guy on youtube https://www.youtube.com/c/jehugarcia he does a lot with recycled lots of batterys from scooters and e-bikes and I remember seeing on there a video where he had a batch in that needed a controller to wake the battery up before it could be used, but with that I think he didnt get any voltage out of the main pins until the battery was activated unlike yours.

 

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