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[TLC]

Today I was riding in level 1 (.08%) around 18-19MPH battery was reading 52.6volts when after just 15 miles the bike shut off. The display went blank nothing was working. I reached and turned off and on the battery, tried to start up the display nothing I shut off the battery and rode back with nothing but human power. When I go home I unplugged the battery cable and checked battery voltage the voltage was 31.1 volts. I'm recharging the battery now but I really don't know what to look for. I reprogramed the controller last week and rode 122miles and the motor was supper smooth after the reprogramming. What should I look for? The bike did shut down on a 73 miles ride four days ago with 45volts showing on the display. I have set the Low Battery Voltage at 41volts. Current Level at 18. The supplier said I voided the warranty when I reprogrammed so its up to me to figure out the problem. All suggestion will be appreciated Thanks

 

[john peck]

Loose connection or fuse?The plug going into the charger can appear plugged in, but needs to be
pushed all the way into the charger, If not, this will cause the charger to overheat. It can screw up the
battery´s ability to fully charge. ´Hopefully´, it may not be too serious if plugged in right. Also, a lot of
batteries automatically shut down before becoming fully discharged. As for programming, if it ain´t
broke, don´t fix it. You may have damaged the circuit board.

 

[TLC]

The battery recharged in 30 minutes 53.3 volts

 

[Gionnirocket]

Today I was riding in level 1 (.08%) around 18-19MPH battery was reading 52.6volts when after just 15 miles the bike shut off. The display went blank nothing was working. I reached and turned off and on the battery, tried to start up the display nothing I shut off the battery and rode back with nothing but human power. When I go home I unplugged the battery cable and checked battery voltage the voltage was 31.1 volts. I'm recharging the battery now but I really don't know what to look for. I reprogramed the controller last week and rode 122miles and the motor was supper smooth after the reprogramming. What should I look for? The bike did shut down on a 73 miles ride four days ago with 45volts showing on the display. I have set the Low Battery Voltage at 41volts. Current Level at 18. The supplier said I voided the warranty when I reprogrammed so its up to me to figure out the problem. All suggestion will be appreciated Thanks

Well a battery voltage of 31v is your problem and I don't think it has anything to do with the motor or programming.

 

[TLC]

I had to reprogram the bike was jerky and couldn't get smooth power at any speed it was all or nothing. Where is the fuse you are talking about? The bike had 52.6volts on the display right before it shut off.

 

[Gionnirocket]

The battery recharged in 30 minutes 53.3 volts

Sounds like you have a battery with bad cell(s)
How are you measuring voltage? Use a meter not the display.
See if it will take a full charge 54.6v... But no longer time wise than normal.
Watch it carefully as a malfunctioning battery can be potentially dangerous.

 

[TLC]

I'm started using a volt meter but when I unplug the battery and check voltage I have voltage when the switch is off. It reads 54 volts when on, reads 33 volts when battery switch is off.

 

[Gionnirocket]

When you took the earlier 31v reading... Was the battery switch On or Off?
Doesn't make sense to have any voltage with the switch off in any case....
Post a pic of your battery and your full installation.
Are you sure that you just don't have a loose (poor) connection between the battery and motor?

 

[TLC]

I might have had the switch off earlier when I first got home and the voltage read 31volts I was very frustrated Having to ride 17miles on my own power. But I removed battery leads I have an extension lead from battery to motor its on a Recumbent. Its hard wired on the motor end but not battery end. Checked battery wire plugins Check the battery holder wires plug ends water cage type holder and everything looks OK I even put a little dielectric grease on both plugs cable and battery mount post. But the battery show voltage when the switch is off. Even checked volt meter 33 when off 54 when switch is on.

 

[Gionnirocket]

And for clarification.. The battery is unplugged from the motor when you read a voltage in the 30v range?
Reason being that the controller/display hold a residual voltage after power down.
I still think it sounds like a battery issue. Have you tried to ride now that you are fully charged?
When applying dielectric grease, did you apply it directly to the copper contacts? It's very definition is an insulator so when applying you do it to the surrounding plastic connector only to keep moisture out, not the copper contacts.

 

[mxer]

Sounds like a bad BMS in the battery?.. I'd suggest taking the battery to someone who can read the BMS's string voltages with a meter. 73miles is a big ask on any battery (not that I know what ah or motor you have?) But sag on lvc would of been v close. Batteries don't like 100% 0% I tend to keep to 90% 30% good luck with sorting it..

 

[TLC]

Yes the motor is unplugged from the motor, I haven't tried ridding it since I got home will try tomorrow if weather permits. I know it not the grease I just applied it today. But I will clean all the contacts. Don't know anyone who can do the BMS test. The 73 miles ride the bike shut down with a voltage of 45volts on display. Thanks

 

[mxer]

Yes I'd never hit lvc especially at full gunning it towards the end of low voltage. I'm afraid you've cooked your battery dude you'll need to find out what string is dead but in all honesty BMS or cells hard to tell. I'd do some multi meter testing on the battery see what voltage you've got before the BMS when it sits at 31v and go from there

 

[mxer]

Btw, quality cells and BMS's can handle lvc, but poor quality cells drop like a stone and never recover (hold charge) once they get anywhere near low voltage they fall of a cliff.

 

[Gionnirocket]

I wouldn't go there just yet without more information as this problem can easily be a poor connection.
What motor / battery do you have?
When it shut down...is the motor working hard? Do you know the current draw at the time?
One thing that you can do if all is working now is to test the battery voltage through the charge port.. Making sure to leave the switch ON, see if the voltage is the same as the Discharge Port. This isn't possible with all batteries/bms's but typically is.
If it is... Then if you experience another shut down without disturbing anything or touching the switch, measure the voltage through the charge port. This will tell you if the problem is on discharge port side of the BMS as well as directing you to possibly finding a poor connection to the motor. If the voltage is lower than it should be, then it's probably a BMS or cell issue within the battery.
Depending on the style of charge port it can be a little tricky to measure without shorting so I highly recommend making up a test lead if necessary.
Try to keep an eye on voltage as you ride as this is more information as well.
Post a pic of your battery if you can.

 

[TLC]

M how do you cook your batteries with the motor have a low Voltage cut off and the battery having one also. How can they cook when the voltage reads 45volts. I need to know so I won't do it again. I have a Bafang BBSO2 750Watt kit. I have don't run any higher than 40% (Except on time right after installing the kit and that was only 80% for a short period) This morning I charged until the charger had a green light battery read 53.8 with for a ride it shut off after one mile. Battery read 32.8 plugged in charger and in nine minutes had the green light and voltage read 53.8.. Went for another ride one mile later it shut off voltage read 32.7 plugged in charger in nine minutes had a green light voltage read 53.8. . Put the bike on a test stand put control on #3(30%) tied the throttle letting the bike run after a few minutes pushed rear brake again wheel causing motor to load and it shut off voltage read 32.7 again. While riding the voltage reads 52 plus or minus a couple tenths.

 

[TLC]

I have an E-bike Essentials Whale Shark battery, I plan on sending the battery back in the morning. Will order a new battery in the mean time. E-Bike Essentials doesn't want to talk because I reprogrammed the controller But I will send the battery too them and just see what they have to say after testing the battery.

 

[Gionnirocket]

M how do you cook your batteries with the motor have a low Voltage cut off and the battery having one also. How can they cook when the voltage reads 45volts. I need to know so I won't do it again. I have a Bafang BBSO2 750Watt kit. I have don't run any higher than 40% (Except on time right after installing the kit and that was only 80% for a short period) This morning I charged until the charger had a green light battery read 53.8 with for a ride it shut off after one mile. Battery read 32.8 plugged in charger and in nine minutes had the green light and voltage read 53.8.. Went for another ride one mile later it shut off voltage read 32.7 plugged in charger in nine minutes had a green light voltage read 53.8. . Put the bike on a test stand put control on #3(30%) tied the throttle letting the bike run after a few minutes pushed rear brake again wheel causing motor to load and it shut off voltage read 32.7 again. While riding the voltage reads 52 plus or minus a couple tenths.

I do not think that you have done anything to damage the battery... I believe it is defective.
Shipping a battery is not easy so returning it without the sellers help may be difficult and expensive due to hazardous material shipping restrictions.

I assume that the low 30v readings after shut down is taken directly at the battery discharge port with the switch ON? If yes then it is most likely defective.
How long have you had it?

 

[TLC]

I have around 400 miles on the battery, yes I unplug the battery from the wiring harness and check voltage. I just hope they don't give me an trouble. I have never shipped a battery you say I need their help with shipping? I sent them an e-mail they will receive it tomorrow just have to wait and see what they say.

 

[Gionnirocket]

I've never shipped a battery but from what I understand to do it properly it must be packed and marked correctly... So if you have the original shipping box, that will help. Then to ship it is not inexpensive due to the Li-ion having restrictions.
I also believe that you may also need to be pre_authorized by the shipping company to initiate a shipment.
Maybe someone with more experience will comment... But you can also call Fed-Ex or UPS