About the Bosch PowerTube 500 Horizontal Battery (BBP3750)

Packs are described by voltage, which sets electrical compatibility, and by capacity in watt-hours, which indicates how much energy is stored and broadly how far a charge can last. Closest alternatives by price: Bosch PowerTube 625 Horizontal Battery ($1,399), Giant EnergyPak 500 Top Load Battery ($1,199) and Bosch PowerTube 500 Vertical Battery ($1,149).

Commuters who cannot charge at work can benefit from a spare pack that swaps in quickly, keeping the bike useful across a long day. Ask about the age of the stock and how it has been stored, as lithium cells lose condition when left discharged on a shelf for long periods.

Listed as suiting 11 vehicles in the catalogue, including Trek Allant+ 8 ST, Cube Touring Hybrid ONE and Cube Touring Hybrid ONE 400. Bosch has 7 products listed, from $119 to $1,599.