E-bike battery: upgrade 18650 cells
Without knowing the original cells to compare datasheets, I believe your first order of priority would be to measure the de-facto charging mode of the charger and then try to estimate if the new cells are up to it - particularly by the charging current parameter (as pointed out in the comments), which happens to be about 1700mA in CC-CV 0.5C mode according to the Panasonic Datasheet.