Range anxiety hits different on an e-bike than it does in a car—there's no calling for a tow truck when the battery dies fifteen miles from home on a ride that turned out hillier than the map suggested. The Specialized SL Range-Extender Battery is built for exactly those situations, adding up to 40 additional miles of assist to Turbo SL-equipped bikes from a 160Wh cell that slips into a standard bottle cage position. It complements the internal battery to keep you rolling when the ride runs long.

The battery ships with a Zee Cage and a retainer band, so mounting to your water bottle bosses is handled out of the box. A 3-LED indicator on the battery tells you how much charge is left at a glance, and it runs off the same standard SL charger you already own—no separate charging setup to buy or manage.

Here's the part that trips people up, so read it before you check out: the connection cable is NOT included. You order it separately based on your frame, and the length is specific to your bike—220mm for Creo SL, Vado SL, and Como SL; 160mm for 1st-generation Levo SL; 145mm for 2nd-generation Levo SL; and 285mm for Kenevo SL. At Excel, that cable is part number 120210. Buy the battery without the matching cable and you won't be able to connect it, so grab both together.... Read More