Bafang m820

[Freda]

Will it fit to the frame?

Well it is probably maximum, but posted in other thread this: LCE930

Basically a tape wrapped battery without case, bms needs to go somewhere also. It needs to be a tight fit or have some kind of fastenings to stay in place. Your idea would probably be a more safe option and still lighter then oem battery.

I still don't undestand the can bus connection. If you make custom battery without that and it works, then why they use the can bus in the first place?

 

[brbr]

Hey Guys, the motor vendor proposed me the besst tool for 100usd, it seems to be a good price, what do you think?

 

[temon10]

Hey Guys, the motor vendor proposed me the besst tool for 100usd, it seems to be a good price, what do you think?

that' s the price

 

[LAnton]

The second motor has a different firmware. What has changed?

 

[temon10]

The second motor has a different firmware. What has changed?

View attachment 117495 View attachment 117496

U have to review it and comparing for us

And maybe someone can provide this new firmware here so I can test it on my M820.

 

[LAnton]

If the 20% battery charge limit is removed there, then this is good. I will be able to check it after assembling the bike

 

[temon10]

If the 20% battery charge limit is removed there, then this is good. I will be able to check it after assembling the bike

20% battery charge limit? what is it?

 

[mike_kelly]

It is the point the BMS decides the battery is too low to continue without damaging the battery. So it turns it off.

 

[LAnton]

The motor reduces power by less than 20%. It seems to me up to 30-40% of the motor power. It is very annoying when there is a spare battery in the backpack.

 

[temon10]

The motor reduces power by less than 20%. It seems to me up to 30-40% of the motor power. It is very annoying when there is a spare battery in the backpack.

mine no reduce power under 20% battery, never tried under 10%

 

[brbr]

mine no reduce power under 20% battery, never tried under 10%

interesting, custom battery, no bafang ?
Maybe you are in a different voltage or different firmware ?

 

[temon10]

interesting, custom battery, no bafang ?
Maybe you are in a different voltage or different firmware ?

Battery from CEF50 factory. 720Wh.

 

[brbr]

I should finally receive my motor soon, custom clearance in progress! for the battery, I'm still waiting a date tho...
If it's in 2/3 weeks I can wait, if it's more, I'll go DIY

 

[Dado]

Guys,
dont u have any M820 firmware bin file, pls? Can u share?

 

[temon10]

If I build 43v m820 version, what type of charger I can use for 43v battery? 50.4v charger?

 

[Dado]

If I build 43v m820 version, what type of charger I can use for 43v battery? 50.4v charger?

Yes. It is 12S charger.

 

[brbr]

Guys, 1am I the only one with the direct mount and not the chainring spider?

 

[temon10]

Guys, 1am I the only one with the direct mount and not the chainring spider?
View attachment 118210

This must be the new M820 revision. Can u check controller firmware version?

 

[brbr]

This must be the new M820 revision. Can u check controller firmware version?

is it the number on the sticker on engraved in the motor ?

 

[brbr]

is it the number on the sticker on engraved in the motor ?

 

[LAnton]

View attachment 118216

Steel or aluminum?

Guys, 1am I the only one with the direct mount and not the chainring spider?
View attachment 118210

Steel or aluminum?

 

[brbr]

Steel or aluminum?

Steel or aluminum?

I’ll test it with my magnet

 

[LAnton]

I’ll test it with my magnet

Do you have a DP 244 or 245 remote control?

 

[brbr]

Do you have a DP 244 or 245 remote control?

245 yes!

 

[temon10]

View attachment 118216

43v, mine 36v

 

[LAnton]

245 yes!

You can view the version on the remote .

 

[brbr]

You can view the version on the remote .

No battery yet…
And no news from bafang btw

 

[brbr]

Steel or aluminum?

Steel or aluminum?

it looks like only the teeth are in steel

 

[LAnton]

it looks like only the teeth are in steel

Very interesting. This is something new. Hybrid technologies of the future. How much does it weigh?

 

[Dado]

Guys, 1am I the only one with the direct mount and not the chainring spider?
View attachment 118210

Seems like steel teeth. Thats unlucky they do not sending spider, where u can mount good alu wide narrow chainring.

How is outer ring mounted to spider? Some screws from the back? Or just pressed?

Please put it on a scale. That spider seems to me quite massive.