Hello. I am expecting my new Nokta Legend pro pack this Friday, and I am already "pre-learning" it (watching videos, studying the manual that I downloaded, etc.) My question is about the external battery: Am I supposed to connect it only after the internal battery is depleted, or is it ok to start detecting with both batteries full charged and the external connected before the internal one runs out? I can't find an answer to it in the manual, and I am afraid to do anything that may damage the detector. Thanks!