How to reboot my BMS? Anyone know much about a battery reconditioner/recycler?

[kauaicycler]

My battery appeared to lose it’s capacity overnight so I contacted EM3ev and they told me that my battery is ok but the BMS needs to be reset/rebooted.

The instruction I got from EM3ev said to drain and recharge the battery three times to reset it by riding the bike until the controller shuts it down. This has not worked after trying multiple times. Maybe my bike is shutting down before the battery drains enough to reset it

I was talking to my friend who flew rc planes about my battery/bms problem and he suggested a battery reconditioner/recycler. I have a 52v battery would something like this work or even exist?

Here are some screenshots of my battery.

Before Draining



After



Here is what it used to look like

 

[E-HP]

Here is what it used to look like
IMG_1571.png

When it's was working correctly, was the "Full Capacity" info static? I see it's changing now between when the battery is full vs empty (rather than staying at 20577mAh).

 

[kauaicycler]

Here is what it used to look like
IMG_1571.png

When it's was working correctly, was the "Full Capacity" info static? I see it's changing now between when the battery is full vs empty (rather than staying at 20577mAh).

Yes the full capacity was always 20577mAh.

 

[E-HP]

Here is what it used to look like
IMG_1571.png

When it's was working correctly, was the "Full Capacity" info static? I see it's changing now between when the battery is full vs empty (rather than staying at 20577mAh).

Yes the full capacity was always 20577mAh.

Did you buy the controller from EM3EV (how did they know the LVC?)? Also, are you sure they meant the controller's LVC vs the BMS' LVC (looking at their battery primer page and looks like their BMS's may have an LVC).

If that value was originally learned by the BMS, based on either the maximum or average energy discharged after a few charge cycles, then it probably needs to be set using the original parameters and minimum voltage assumptions. That could be anywhere from the entire voltage range from 4.2V to 2.5V to something likely more conservative. Is it a bluetooth model so you can view/set the LVC?

 

[kauaicycler]

Here is what it used to look like
IMG_1571.png

When it's was working correctly, was the "Full Capacity" info static? I see it's changing now between when the battery is full vs empty (rather than staying at 20577mAh).

Yes the full capacity was always 20577mAh.

Did you buy the controller from EM3EV (how did they know the LVC?)? Also, are you sure they meant the controller's LVC vs the BMS' LVC (looking at their battery primer page and looks like their BMS's may have an LVC).

If that value was originally learned by the BMS, based on either the maximum or average energy discharged after a few charge cycles, then it probably needs to be set using the original parameters and minimum voltage assumptions. That could be anywhere from the entire voltage range from 4.2V to 2.5V to something likely more conservative. Is it a bluetooth model so you can view/set the LVC?

I bought a bbshd kit with a egg rider display, everything from EM3ev. It’s worked flawlessly for a couple of years.

 

[E-HP]

I bought a bbshd kit with a egg rider display, everything from EM3ev. It’s worked flawlessly for a couple of years.

Is you actual range, running the battery from 58.8 to 46V, the same as before, or 1/3 of that now?

 

[kauaicycler]

I bought a bbshd kit with a egg rider display, everything from EM3ev. It’s worked flawlessly for a couple of years.

Is you actual range, running the battery from 58.8 to 46V, the same as before, or 1/3 of that now?

Probably less than 1/3 of what it was. Once I had a problem I didn’t trust it so I only rode it to discharge it per EM3ev instructions. I got frustrated after multiple attempts that I haven’t ridden in months. I’m thinking my battery/BMS never reached the threshold to reset/reboot.

 

[E-HP]

I bought a bbshd kit with a egg rider display, everything from EM3ev. It’s worked flawlessly for a couple of years.

Is you actual range, running the battery from 58.8 to 46V, the same as before, or 1/3 of that now?

Probably less than 1/3 of what it was. Once I had a problem I didn’t trust it so I only rode it to discharge it per EM3ev instructions. I got frustrated after multiple attempts that I haven’t ridden in months. I’m thinking my battery/BMS never reached the threshold to reset/reboot.

It seems like it could be a battery/cell issue rather than the BMS. If those are the actual pack voltages, then that voltage range should represent about 95% of the total pack capacity, or what the pack is currently capable of. Are you getting a lot of voltage sag?

 

[kauaicycler]

I bought a bbshd kit with a egg rider display, everything from EM3ev. It’s worked flawlessly for a couple of years.

Is you actual range, running the battery from 58.8 to 46V, the same as before, or 1/3 of that now?

Probably less than 1/3 of what it was. Once I had a problem I didn’t trust it so I only rode it to discharge it per EM3ev instructions. I got frustrated after multiple attempts that I haven’t ridden in months. I’m thinking my battery/BMS never reached the threshold to reset/reboot.

It seems like it could be a battery/cell issue rather than the BMS. If those are the actual pack voltages, then that voltage range should represent about 95% of the total pack capacity, or what the pack is currently capable of. Are you getting a lot of voltage sag?

I’m sorry I don’t know, I haven’t ridden in months. Do you think my friends idea of a reconditioner/recycler might fix it? Or maybe someway to achieve the same thing? He described a device that would charge and discharge the battery multiple times which is similar to what EM3ev said.