Can I remove Whiz batteries mid-route?

The battery can be removed but should be replaced with a charged battery within 15 minutes to avoid route disruption or full power loss. Whiz comes with an internal battery, which allows the machine to function for up to 15 minutes while the primary battery is being changed. Before exchanging batteries, make sure that the internal/secondary battery is turned on (see, "What is the Secondary Battery and how do I set it?").