Bafang m820

[streyer]

The spider is compatible with the M510 and M600. They have slight differences, but they fit.they work. I have three motors M820, M510 and M600.

HI LAnton, need your kind advise does m510 spider fits the m820?

 

[Waynemarlow]

I will store/charge it in warm garage, so initially it will be ok, maybe just better to skip the really cold days.

If you have already purchased the batteries then there is only one way to find out whether the cold will have an adverse effect, go ride.

My guess would be that if you are starting from a warm battery then you should be fine. The only real issue will be is when you stop off for a long lunch and coffee and leave the bike outside.

There's quite a number of neoprene thermal covers you can buy for Ebikes, it maybe worth investing in one.

 

[brbr]

If you have already purchased the batteries then there is only one way to find out whether the cold will have an adverse effect, go ride.

My guess would be that if you are starting from a warm battery then you should be fine. The only real issue will be is when you stop off for a long lunch and coffee and leave the bike outside.

There's quite a number of neoprene thermal covers you can buy for Ebikes, it maybe worth investing in one.

View attachment 126697

I was trying to understand what is the worst thing that could happen ?
The cells will heat because you're draining more than they can deliver, by heating, they will deliver more power and stabilise ? that's it ? I don't see any risks here but I'm far from being an expert

 

[Waynemarlow]

Most manufacturers recommend not to stress the cells too much when they are very cold, it can shorten their max charging life somewhat. But then we probably will not ever do more than the 5 - 10 K of cycles they recommend as full expected lifespan, so does it really matter if we do shorten the cell life a small tad ?

One of the guys I ride with has just done 2500 miles on his Rail, typically only doing 25miles a charge in all weathers including some below zero night temps. Thats only 100 charges. His battery is down to 95% full charge, so its still going strong.

 

[RiderOnTheStorm]

Hi @brbr, if you're interested in charging best practices and battery care in general, take a look at this other thread:

Do's and Don'ts for e-bike battery care. What do you do to keep your battery performing at its best?

What is your experience and recommendations for taking care of your lithium-ion batteries and maximize their lifespan and performance? What do you do to keep your ebike battery in top shape? Over the years, I wrote down a few best practices and made the list below. I'm interested in your...

www.emtbforums.com

 

[LAnton]

HI LAnton, need your kind advise does m510 spider fits the m820?

Yes. Right side M510, Left side M820
I don't like the spider on the M510. You cannot change the position of the front star. In the M820 and M600, you can shift the front star closer to the motor.

 

[borysgo2]

Hi
I am in process of assembly of lce930 with m820 motor.
I have ordered 43V motor and the battery kit.

Is my firmware 36 V version ??

Another issue I have, battery level indicator stays at 36% after a few hours of charge.
The charger green LED stays ON solid when I putt the plug into the charging port, have anyone had same issue ?

Thanks

 

[brbr]

Hi
I am in process of assembly of lce930 with m820 motor.
I have ordered 43V motor and the battery kit.

Is my firmware 36 V version ??

Another issue I have, battery level indicator stays at 36% after a few hours of charge.
The charger green LED stays ON solid when I putt the plug into the charging port, have anyone had same issue ?

Thanks

View attachment 126725

Yes it looks like a 36v controller.
You have the besst tool, the change is easy

 

[brbr]

Yes it looks like a 36v controller.
You have the besst tool, the change is easy

For the battery, you have to plug it firmly, otherwise it’s not charging

 

[borysgo2]

Thanks.

I have besst tool, where can i find 43V firmware ??

Thanks

 

[brbr]

Thanks.

I have besst tool, where can i find 43V firmware ??

Thanks

Check the m820 firmware thread, I think it’s a pinned topic

 

[borysgo2]

OK have a firmware. Just instruction is not clear.
Can I update firmware via interface connected into the HMI display or have to remove motor and plug it directly to the motor itself ??

 

[brbr]

OK have a firmware. Just instruction is not clear.
Can I update firmware via interface connected into the HMI display or have to remove motor and plug it directly to the motor itself ??

Just plug it normally instead of the display

 

[brbr]

I’m driving right now so i don’t have nor the pc nor the besst tool but I think therés an update menu?

 

[borysgo2]

OK
Firmware updated to 43V and battery started to charge OK.
Thanks for help.
A BIG THANKS

 

[brbr]

OK
Firmware updated to 43V and battery started to charge OK.
Thanks for help.
A BIG THANKS

No problem! Good ride !

 

[borysgo2]

M820 --> light output 12V 500mA, question there, is the output constant current type (like LED driver) or rather constant voltage 12V with 500mA over current protection (power off when protection is active) ?

Thanks

 

[clix]

M820 --> light output 12V 500mA, question there, is the output constant current type (like LED driver) or rather constant voltage 12V with 500mA over current protection (power off when protection is active) ?

Thanks

Second one. Output is constant 12V, with the overcurrent protection. But, to me, this overcurrent protection looks rather wierd.
I have a light with cca 380mA at 12V. If I have the light connected, while I turn it on with the HMI, it triggers overcurrent protection and ligth is just blinking. But, If I turn it on in HMI, and connect it later, it works. To me, it looks like inrush current to my light is triggering OC protection, but the protection is active only right after the turn on.
I solved this issue, with the 0.5 Ohm resistor in series to the lamp, to lower the inrush current. Now it works as expected.

 

[brbr]

M820 --> light output 12V 500mA, question there, is the output constant current type (like LED driver) or rather constant voltage 12V with 500mA over current protection (power off when protection is active) ?

Thanks

On my side I used a dc dc converter pluged on the main battery. My light was too powerful for the default light output.
I think I will use the integrated light connector for the rear light

 

[Dado]

Best from main battery, also have it over dc/dc.
Cars are mad of me. 25W Led light, it is strong as sh... Was surprised I feel heat on my skin when pointing on me.

 

[brbr]

Best from main battery, also have it over dc/dc.
Cars are mad of me. 25W Led light, it is strong as sh... Was surprised I feel heat on my skin when pointing on me.

I only have 2000 lumen! In complete darkness in the forest it was a bit scary
I now use a 3500 lumen on my helmet in addition, I ran into a runner in the woods, I think he didn’t recover fully his vision yet

 

[Dado]

He could have also think aliens came down. Same experience.
Mine is labeled as 5000lm, but it can have cca 2500.

 

[Freda]

Could you share what lights you are using? At 12V a small floodlight with wide beam could work.

 

[brbr]

Could you share what lights you are using? At 12V a small floodlight with wide beam could work.

Magicshine me2000, the only downside is that there is no on/off button. It’s always on with a luminosity detector

 

[Dado]

Also Magicshine. And seing it in good price here, but used: MAGICSHINE MJ-900S Lumens LED Bike Front Light Powerful Waterproof USB Rech Road | eBay

 

[brbr]

I've also bought one on Aliexpress, the M03 : 18.38￡ 47% de réduction|Enquêter avant étanche pour vélo, 3000 lumens, éclairage de sauna, feux de route et de illeur, éclairage de vélo en alliage d'aluminium, feu de vélo VTT | AliExpress
I did a custom battery with spare cells and it's very bright!

 

[borysgo2]

Hi. Got a bit of the problem with charging of Btf014 battery. At the moment it is 59% left @ 45V, when I plug the charger in, it does not go red(charging), lights up solid green instead (like fully charged). There is no faults in diagnostics. Just wondering if there is a voltage threshold that battery can not be topped up when over 50%?

 

[brbr]

Hi. Got a bit of the problem with charging of Btf014 battery. At the moment it is 59% left @ 45V, when I plug the charger in, it does not go red(charging), lights up solid green instead (like fully charged). There is no faults in diagnostics. Just wondering if there is a voltage threshold that battery can not be topped up when over 50%?

I’ve seen that the charger sometimes is plugged but does not charge, you have to plug it again or turn it in order to have a good contact, maybe that’s the issue

 

[mike_kelly]

Hi. Got a bit of the problem with charging of Btf014 battery. At the moment it is 59% left @ 45V, when I plug the charger in, it does not go red(charging), lights up solid green instead (like fully charged). There is no faults in diagnostics. Just wondering if there is a voltage threshold that battery can not be topped up when over 50%?

If the battery charger was not for the right voltage, say 36v, it would charge until it reached 36v and shutoff.

 

[borysgo2]

If the battery charger was not for the right voltage, say 36v, it would charge until it reached 36v and shutoff.

Charger is 49.2V 2A, battery 45V. Contacts look OK. Have to prapobly dismantle the bike a bit.