M820 Bafang - LIGHTCARBON LCE930 Frame (lightweight)

[brbr]

Morning ride! 100% —> 12% (currently I’m using the 180Wh battery)
I really felt the cutoff at 20 %
All the time in Sport mode!

 

[JimLee-Lightcarbon]

the charging port in frame provided by Lightcarbon or Bafang battery? @JimLee-Lightcarbon

the out charge port from bafang company,

 

[JimLee-Lightcarbon]

An installation video of M820 on LCE930:

 

[JimLee-Lightcarbon]

motor kits from bafang

small parts from LC

Cable of sensor should be two-parts style

 

[Peter A]

Hi Jim,

Have you found any alternative solution to connecting an extender battery directly to the main battery?

@JimLee-Lightcarbon

 

[JimLee-Lightcarbon]

@JimLee-Lightcarbon

Connect the extended battery cable into the out charge port.

 

[Goff]

I wonder if a Forestal software up grade would make a difference?

 

[JimLee-Lightcarbon]

I wonder if a Forestal software up grade would make a difference?

In theory it is possible because the Forestal also uses Bafang batteries and Bafang Besst tools.

 

[brbr]

Connect the extended battery cable into the out charge port.

it will work ? if that's all what is needed that's good.
Don't we need a diode to avoid current flowing it back ?

 

[KaroKönig]

Connect the extended battery cable into the out charge port.

I will use this dualbattery discharger, but I have to drill a hole in this place for the connection. I hope that's O.k.
@JimLee-Lightcarbon ??

 

[clix]

Cable of sensor should be two-parts style
View attachment 124112

Hey, why do you say, that is should be two part style? I have one part style, and I havent found an issue with it yet. I did't connect it yet, but I did route it trough the chain stay just fine.

 

[JimLee-Lightcarbon]

Hey, why do you say, that is should be two part style? I have one part style, and I havent found an issue with it yet. I did't connect it yet, but I did route it trough the chain stay just fine.

Two parts style is easy to trough the hole on chain stay, If you try to trough the charin stay is ok, that's fine,

 

[JimLee-Lightcarbon]

View attachment 124121


I will use this dualbattery discharger, but I have to drill a hole in this place for the connection. I hope that's O.k.
@JimLee-Lightcarbon ??

View attachment 124122

Please no drill the hole on that, use the hole for sensor cable,

 

[JimLee-Lightcarbon]

it will work ? if that's all what is needed that's good.
Don't we need a diode to avoid current flowing it back ?

Only insert the extended battery when the main battery is out of power, and do not leave the interface connected all the time. In addition, ensure that the voltage of the extended battery is not less than that of the main battery. If possible, please use an anti-backflow device.
When we mass-produce extended batteries, we must consider the fixed shape of the battery. However, when DIY batteries, you can try to make a concave rectangle to wrap the odwntube to get more space to accommodate more cells.

 

[brbr]

Guys, I'd like to add a powerful light for my bike and the integrated light output does not provide the needed power.
The solution proposed by klamp is a regulator, to plug directly on your battery connection but the regulator is quite big : 75x35x22mm
For those who installed their battery (btf014), do you think there's enough room in the frame after the battery is installed ? Do you see any other option ?
I've tried to look for 48v-9v DC to DC regulator with an output of 4Amps but it's quite complicated to find that!

 

[temon10]

Anyone already make custom battery inside the frame? Can we put 30pcs 21700 battery for 36v 10s3p configuration?

 

[KaroKönig]

Anyone already make custom battery inside the frame? Can we put 30pcs 21700 battery for 36v 10s3p configuration?

Yes, enough place for a 13S3P custom battery
This is a 13S2P and the "3P" would be 14 cm longer

 

[temon10]

Yes, enough place for a 13S3P custom battery
This is a 13S2P and the "3P" would be 14 cm longer
View attachment 124315 View attachment 124318 View attachment 124316 View attachment 124317

How U hold that battery to frame?

 

[KaroKönig]

How U hold that battery to frame?

With a aluminium bracket

 

[JimLee-Lightcarbon]

Guys, I'd like to add a powerful light for my bike and the integrated light output does not provide the needed power.
The solution proposed by klamp is a regulator, to plug directly on your battery connection but the regulator is quite big : 75x35x22mm
For those who installed their battery (btf014), do you think there's enough room in the frame after the battery is installed ? Do you see any other option ?
I've tried to look for 48v-9v DC to DC regulator with an output of 4Amps but it's quite complicated to find that!

If you tie the cables, there is enough space here; but you need to pass the cables through the downtube first, and then install the battery.

 

[brbr]

If you tie the cables, there is enough space here; but you need to pass the cables through the downtube first, and then install the battery.

View attachment 124335

thanks! I will try this

 

[Goff]

Here’s my diy battery build, 10S 3P 18650 cells wrapped in carbon.

 

[brbr]

Here’s my diy battery build, 10S 3P 18650 cells wrapped in carbon.

View attachment 124416 View attachment 124417 View attachment 124418 View attachment 124419 View attachment 124420 View attachment 124421 View attachment 124422

The serial connection between the parallel blocs are done with wires? Is it enough to handle the current?

 

[temon10]

Here’s my diy battery build, 10S 3P 18650 cells wrapped in carbon.

View attachment 124416 View attachment 124417 View attachment 124418 View attachment 124419 View attachment 124420 View attachment 124421 View attachment 124422

with 18650 cell will fit on 3x2 row. but with 21700 will it fit to frame?

 

[Goff]

with 18650 cell will fit on 3x2 row. but with 21700 will it fit to frame?

I’m not sure they would need to be staggered, My battery is the same size as the bafang battery 63 x 53 and it’s really tight.
My frame is slightly tighter at the top.

 

[kimochi]

Hey @JimLee-Lightcarbon , what's the biggest battery that can fit the frame? I think I saw in a different post that there is a 21700 540wh battery available for m820? Thanks!

 

[JimLee-Lightcarbon]

Hey @JimLee-Lightcarbon , what's the biggest battery that can fit the frame? I think I saw in a different post that there is a 21700 540wh battery available for m820? Thanks!

the standard battery is 410wh,. with 18650 cells, if you use DIY battery with 21700wh, the battery can be 540wh, you find the big battery from a italy bike brand, right? the frame is from us and they make the battery by themself,

 

[haydz26]

the standard battery is 410wh,. with 18650 cells, if you use DIY battery with 21700wh, the battery can be 540wh, you find the big battery from a italy bike brand, right? the frame is from us and they make the battery by themself,

what is this brand jim? keen to see specs of battery as cannot get the bafang battery to n.z now

 

[haydz26]

has anyone tried running the 930 in a mullet setup with 29 front and 27.5 rear?

 

[brbr]

has anyone tried running the 930 in a mullet setup with 29 front and 27.5 rear?

I went to full 29 but maybe if I change wheels et one day I'll go mullet