The 840-Wh battery has 39 cells, each containing 13s3 p (6.0 A x 3.6 V = approx. 840 Wh). The rated voltage is 46.8 V and is rounded to 48 V for marketing purposes.
However, I don't think the full 840 Wh can be used because the battery switches off at a cell voltage of 3 V instead of 2.5 V. I...