Very efficient. Batteries arrived sooner than promised. And well packaged, too, but they needed to be as Battery Station chooses to use Hermes (recently rebranded as Evri) as their courier, and Hermes came almost bottom in a world-wide assessment of couriers. In my case, my little parcel was thrown through my gate to land on my garden path where it would have got soaked had it rained. The door bell was not rung as this is not required of a Hermes delivery-person. So, in summary, Battery Station deserve five stars but I've docked them three for their very poor judgement in choosing the shamefully incompetent Hermes/Evri as their courier. Shame. If they change their courier, and I hope that they do, I'll change their star rating.