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Okai 400B external battery autopsy.

Posted: Sat Aug 14, 2021 12:42 pm
by Skupik
Hi

I’v managed to salvage some Tier Okai 400B external batteries.
Those are 47V 14.7Ah/690Wh batteries.
Made out of Samsung’s INR21700-50e cells in 13s config.
Battery itself is quite heavy, with big aluminium casing having a handle and a display on top -showing SOC%, battery Voltage and temperature.

On the top there is only a bunch of small cables connected to the LCD itself. Image
Image

On the bottom - we got MR60-M connector with common „+” and two grounding ports - one for load, and second for charging. Also a 5-pin communication connector.
Image

Everything held together with bunch of Torx security T10 screws. Very well waterproofed with two gaskets and extreme amounts of conformal coating silicone paste.


It’d be really hard to get the battery out from the case (because of the silicone) and access to the BMS, but I’ll try.

More pics will follow.
If anyone know how to wake the battery up using built-in BMS - please PM me.

Image

Re: Okai 400B external battery autopsy.

Posted: Thu Aug 19, 2021 5:18 pm
by satann
how many volts u measure? i only get 24 v on mine eventho it says 97% charged why?

Re: Okai 400B external battery autopsy.

Posted: Sat Aug 21, 2021 10:52 pm
by Jesus
wow you're quite lucky to have these.
Can you confirm that the internal battery and the swappable battery are the same?

Thanks
Skupik wrote:
Sat Aug 14, 2021 12:42 pm
Hi

I’v managed to salvage some Tier Okai 400B external batteries.
Those are 47V 14.7Ah/690Wh batteries.
Made out of Samsung’s INR21700-50e cells in 13s config.
Battery itself is quite heavy, with big aluminium casing having a handle and a display on top -showing SOC%, battery Voltage and temperature.

On the top there is only a bunch of small cables connected to the LCD itself. Image
Image

On the bottom - we got MR60-M connector with common „+” and two grounding ports - one for load, and second for charging. Also a 5-pin communication connector.
Image

Everything held together with bunch of Torx security T10 screws. Very well waterproofed with two gaskets and extreme amounts of conformal coating silicone paste.


It’d be really hard to get the battery out from the case (because of the silicone) and access to the BMS, but I’ll try.

More pics will follow.
If anyone know how to wake the battery up using built-in BMS - please PM me.

Image

Re: Okai 400B external battery autopsy.

Posted: Fri Aug 27, 2021 1:56 am
by baubabauu
Tried to push cells ouț and this happenedImage
Image

I am waiting for other way to work the battery.
It runs into protection after a few seconds

Re: Okai 400B external battery autopsy.

Posted: Fri Aug 27, 2021 11:39 am
by ivymetro
Angle grinder dude.

Re: Okai 400B external battery autopsy.

Posted: Wed Sep 08, 2021 10:25 am
by iddik75014
Hi Skupik,

Are you showing on your pictures that battery ?

I have that one but I don't know how to take it off from the scooter :

Image

Could you please tell me how to proceed for extraction of the battery ?

Skupik wrote:
Sat Aug 14, 2021 12:42 pm
Hi

I’v managed to salvage some Tier Okai 400B external batteries.
Those are 47V 14.7Ah/690Wh batteries.
Made out of Samsung’s INR21700-50e cells in 13s config.
Battery itself is quite heavy, with big aluminium casing having a handle and a display on top -showing SOC%, battery Voltage and temperature.

On the top there is only a bunch of small cables connected to the LCD itself. Image
Image

On the bottom - we got MR60-M connector with common „+” and two grounding ports - one for load, and second for charging. Also a 5-pin communication connector.
Image

Everything held together with bunch of Torx security T10 screws. Very well waterproofed with two gaskets and extreme amounts of conformal coating silicone paste.


It’d be really hard to get the battery out from the case (because of the silicone) and access to the BMS, but I’ll try.

More pics will follow.
If anyone know how to wake the battery up using built-in BMS - please PM me.

Image

Re: Okai 400B external battery autopsy.

Posted: Wed Sep 08, 2021 2:28 pm
by baubabauu
Search for okai es400 v4 forum and there are the explanations for removing the battery

Re: Okai 400B external battery autopsy.

Posted: Wed Sep 08, 2021 5:44 pm
by feaoafhzap
Deleted

Re: Okai 400B external battery autopsy.

Posted: Thu Apr 14, 2022 2:21 am
by STO
I have 15pices of the okai es 400b battery

I like to build a powerwall and use the battery s

But I dont like to rip them apart

Is there some communication I need or tldid they stay on all the time?

Re: Okai 400B external battery autopsy.

Posted: Mon Oct 24, 2022 3:13 pm
by Marius Petz
To charge the battery there are 4 pins. There are 2 rows with 7 ports for pins in a row. in the first row it's pin 5 & 7. in the second row it's pin 1 & 3