Charging apple watch

You can, it may have lost some of the charge since leaving the factory.

Pair it with your iPhone and also check to see if there is a watchOS update since the watch was built. The update would need to be installed while the watch is on its charging puck.

However, read a few tech articles about issues with updating to watchOS 10.1 before doing so.

M1 Mac mini, macOS 14.1;  Watch, series 7 GPS/cellular, watchOS 10.1; iPad Pro 2nd Gen, iPadOS 17.1; iPhone 12 Pro, iOS 17.1; TV 4th Gen, tvOS 17.1; HomePods, audioOS 17.1 and Airport Express w/ Airplay 2

Hello,

yes, if you bought brand new Apple watch it's good idea to charge it before first use. To do this you need charging cable included in Apple Watch box.