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I saw the same recently on Amazon. 36V 10.5 Ah means 380 Wh, extending the bike to a whooping 1.100 Wh overall capacity!

Sounds like a plan mate! I missed the info that You plan to run both wheels 27.5 somehow, but I think with the frame designed for 29 rear wheel there will be no issues with 27.5 and increased 55 stroke.

Be careful, the additional 5mm stroke will give You 10-15 mm more travel depending on end of stroke ratio / progression. Good that there is no bridge between the seatstays, but worst case the tire may hit the seattube. Did You consider a mullet setup with 27.5 rear wheel to be on the safe side?

Great plan, and I think You will not be disappointed. May be You can overstroke (210x55 / 216 x 63 shock?) the frame a litte to get more travel and better matching Your 180mm ZEB. Would be very interesting to know if the battery supports CAN communication with the motor controller and display...

I was thinking about that as well, but I was not sure if the front wheel may hit the battery with fully compressed fork. So I decided to buy an Evoc backpack with spine protection and integrated battery pocket. Works well, but the weight is really heavy (~7 kg) with battery, full water bladder...

Totally agree. We‘ve somehow lost track on the thread purpose, the M820. My bad. For me, I‘m thinking about getting this CEF50 frame with the 740 (720?) Wh battery, targeting +-20 kg for the complete bike. Expecting to be able to keep up with any full fat ebike, speed and range. But a more...

This announcment is more then 1 year old, and the cells are still not available yet: https://batteriesnews.com/gotion-high-tech-nickel-rich-li-ion-battery-cell-with-302-wh-kg/

Exactly. With today’s available 21700 cells there is almost no advantage above the today’s 18650 cell (the video shows 257 Wh/kg vs 252 Wh/kg). The future cell they state 302 Wh/kg. Thats a big improvement, but not for today, unfortunately.

Not necessarily - depending on the box format it can be more efficient to use the 18650 cells.

To make it more clear: The 18650 cell weight is ~50g, the 21700 is ~70g.

The advantage of the common 21700 / 5000 mA vs the 18650 / 3500 mA is minimal from the energy density point of view: 255 Wh/kg vs 253 Wh/kg. This is almost nothing. Therefore, to use one ore the other cell format, is more driven by space and required battery configuration, imho..

This one:

Hmmm…the 21700 cells are slightly better at 71 mAh/g then the 18650 at 70 mAh/g. Almost no difference. The 18650 are still a very good choice, robust, technically mature, cheap, available. Depending on the room/volume available and the battery configuration You need it could be the best option...

I added 0,5 kg for the wiring, BMS, housing. No fastener for my understanding, because the battery is „not removable“. Just my guess, I think 1 kg is way too much.

😂👍

720 Wh battery means 10S4P = 40 pcs. 3,6V 5000 mAh 21700 cells, 70g each = 2.800 g for the cells only. Plus wiring / BMS / housing assumption is appr. 3,2 - 3,3 kg for the battery. The M820 motor is quoted 2,3kg, the M510 is 2,9kg, the M600 is 3,9kg. So You save roughly a kilo on the battery...

Rear Triangle looks like Dengfu E10…

Did You test the motor already? Does it still have the high pitch whining noise/whistle? Thanks for n update mate!

Thanks mate, smart explanation! If there is ony one kind of torque sensor available… Then assumption is only the firmware does not support kalorie counting anymore. Thanks for all the time You spend with Your development work! Happy Holidays!

Would be interesting to know if this also works with M510. The torque sensor signal seems to be different- my display does not show any kalories counting with M510 any more….