All-electric range is the driving range of a vehicle using only power from its electric battery pack

Battery pack

A battery pack is a set of any number of identical batteries or individual battery cells. They may be configured in a series, parallel or a mixture of both to deliver the desired voltage, capacity, or power density...

 to traverse a given driving cycle. In the case of a battery electric vehicle

Battery electric vehicle

A battery electric vehicle, or BEV, is a type of electric vehicle that uses chemical energy stored in rechargeable battery packs. BEVs use electric motors and motor controllers instead of, or in addition to, internal combustion engines for propulsion.A battery-only electric vehicle or...

, it means the total range per charge. For a plug-in hybrid (PHEV), it means the range of the vehicle in charge-depleting

Charge-depleting

Charge-depleting or EV mode refers to a mode of vehicle operation that is dependent on energy from the battery pack. Battery electric vehicles operate solely in this mode...

 mode. PHEVs can travel considerably further in charge-sustaining mode which uses both on-board fuel and the battery pack.

A plug-in hybrid's all-electric range is designated by PHEV-(miles) or PHEV(kilometers)km representing the distance the vehicle can travel on battery power alone. For example, a PHEV-20 can travel 20 miles without using its internal combustion engine, or about 32 kilometers, so it may also be designated as PHEV32km.