RE: Some Questions
If you are worried about the battery charge in the model when you are at the flying field you need one of these. [link=https://www.toysonics.com/hobbico-voltwatch2-4.8v-6v-rx-battery-monitor-hcap0332.html]CLICKY[/link]
It is called a Voltwatch and it gives you a good indication of the state of your battery under load. Lots of people will fit one permantly in the cockpit and look at it just before takeoff.