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I'm a believer that a backpack battery is an attractive solution to "more range," because you can: Keep the wheel you have (save money vs buying a new 2500wh+ wheel) Keep the wheel light (easier to lift; ride & handling differences) Use the backpack only when you need it (option to ride wheel-only, or extra-range, depending on your mood) This is especially relevant with the emergence of the small-battery suspension wheels (S18, V11). If you want a 40+ mile all terrain ride without charging stops, an auxiliary battery is needed. If you're already doing it, please reply with a summary of your setup! (Do you like it? Pros and cons? What pack is it? How do you connect it? How do you recharge it?) Some clarifications on methods: Parallel connection: ("Vamp-and-ride" is the futuremotion jargon...) Using an auxiliary pack that has the same system voltage as the wheel. The external pack voltage (state of charge) must match the wheel voltage, before connecting the external pack. Failure to match voltage properly will damage the packs or blow fuses. A high-current input connector must be added to the EUC. (Typically the charging port is not sufficient.) The external pack must remain connected to the EUC for the entire ride, and will deplete at the same rate as the battery in the EUC. Charge-and-ride: Using an auxiliary pack that has a current-limited output voltage, the same as the output from an AC charger. The auxiliary battery pack can be of any voltage, but needs extra electronics to produce the current-limited output voltage that is correct for the EUC. The original charging port of the EUC can be used. (Relocated and break-away-style connectors are sometimes added.) The auxiliary pack can be removed and reconnected at any time, including during a ride. The auxiliary pack will typically be depleted before the battery in the EUC - an additional auxiliary pack could be swapped in at any time to extend range even further. The KS-Power is a charge-and-ride system, for example.