Holder

One mounted Battery Holder. Returned by: self.battery.holders()

Member	Returns	Meaning
.id	string	Holder module id, e.g. "battery_holder_medium"
.size	string	"small" / "medium" / "large" (1 / 2 / 3 bays)
.capacity	number	Rated Wh across every battery in this holder
.wh	number	Current Wh in this holder
.batteries	list	Indexed by internal slot: a PortableBattery or None per bay

Install and remove cells with the Pioneer’s install() / uninstall().