Replacement or backup battery for the Ride1Up Portola folding ebike. This is a 48V, 13.4AH battery using Yiwei Lithium Energy 18650 cells in a 13S4P formation. This is for the battery only and does not include housing, charger, or the extra set of keys. This battery will fit into your existing Portola ebike without any changes needed. *Batteries are not eligible for returns* PLEASE NOTE: Replacement Batteries qualify for free shipping, which saves you approximately $50!