11-01-2017 11:17 AM
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I don't think this is an absolute requirement for replacement battery to have it fully charged.
It would be expected that it has certain amount of charge to maintain battery firmware when purchased and as all the stocked battery would eventually have depleted on certain degree a period of time.
Initially powering it without the ac charger would ensure that it is working fine.
You can simply proceed to check if the new battery is recognized by the laptop, charging eventually within 3-4 hours being plugged in.
Hope this helps answer your query.
Update us how things go.