Each LabQuest 2 includes a "wall wart" plug-in AC charger. If you have AC power at each lab station, we usually recommend that you just leave your LabQuests plugged in at each station the entire semester. That way, you never need to worry about whether or not a battery is charged.
The Charging Station is an optional accessory that lets you organize the LabQuests in a room by providing four charging slots and a "home" for each LabQuest. If you have a limited number of outlets in your classroom, this is handy because it lets you charge four LabQuests using only one outlet. We recommend charging stations for anyone who takes the LabQuests out and puts them away at the end of a lab period.
TIL 2018: What is the best way to store LabQuest units over summer vacation?