!!!WARNING!!! For those who are buying batteries, make sure you do not use Vpost or similar services. Their policy is that they do not accept any batteries that do not come with the an electronic device as a single package. If you ordered the device AND a spare battery, your whole package will be rejected.
Of course, if the seller puts down item description as battery charger instead of battery charger with batteries, that might go through. Just a hunch as I've received spare batteries via mail before.