Charging depends on the battery type. Most cameras utilise Li-ion batteries which have fast charge times and have no memory effect.
If the new battery was mine I would use it straight away but watch for it discharging quickly then charge it from a full discharge state. Nikon recommend to charge then allow to cool before use but this may be overcautious.
Li-ion batteries should not be kept in the discharge state instead charge before storage like the manufacturer does before shipping.
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