So the above shows the Shimano BT-8036 (above) and the Darfon E4C0C (below)
As you can see, the Darfon battery connector is different to the Shimano BT-8036.
So both require specific battery mounts and specific external battery charger attachments.
Unfortunately, I don't have the specific model number associated for the Darfon battery mounts specific to whether you use either the ep8 or ep801). But I'll reach out to both Dengfu and Darfon for the exact model numbers and update the thread.
As for the Shimano standard batteries, the mounts will vary depending on which motor you use (which will subsequently determine which battery you can use).
If you use/order the ep8, you'll need the
BM-E8030-A This will work with 1st generation Shimano batteries (
BT-8035 and
BT-8036)
If you use/order the ep801, you'll need the
BM-EN801A. This will work with 2nd generation shimano batteries (
BT-EN805,
BT-EN806 &
BT-EN805L).
I can't comment as to the downtube interior of the CEF52 at this time. So it remains unclear whether the frame will have provisions to swap the upper mount position to use either 504wh or 630wh. But I am aware that the physical dimensions of the Darfon E4C0C battery compared to the BT-8035/BT-EN805 are roughly the same when factoring in the mounts which holds the battery in place. The 720wh E4C0G battery is a bit longer than the 630wh standard Shimano batteries
