Talk about a confusing subject. Long term, short term, in between term. On the matter of battery voltage while not using them for a week or so I see in many video's Tom's Tech Time for example that he states that a Phantom 3 Professional Flight battery should be stored at between 40% and 50% of its total capacity. My question is, can you go by one solid green as an accurate indicator of a battery at 25% charged, and 2 solid greens as an indicator of 50% charged and so on? If not, can a more reliable/accurate method of determining the battery voltage level be established by using a volt meter? If so, where does one put the leads? I see two gold terminals as in the photo I've provided but don't know whether this is the correct place to put them or not. For example, on a Flight Battery with two solid green lights I get 0.15v Can anyone help me with this and perhaps tell me how to get an accurate reading of the voltage on my flight batteries? Thank you kindly. Bud ps Photos attached.