In the ebike nitro where you carry the saddlebags, you could take a second battery to double the autonomy / 48v 9 amp= 48 v 18 amp full, 1) .... buy a second spare battery and carry in the saddlebags, but you need more time with charger or buy a second charger, 2) install a stand where you carry the saddlebags and install a system removable supplementary battery with key and buy extra charger, the battery will increase the weight at least 3 kilograms more, with unloaded batteries electric bicycle becomes normal bike ...... account the total weight and power consumption of 864 watts load .......