Hi; thanks for the interest.

No, the problem is common to (3) three different Li-Po batteries. All three have been used in their respective planes many times over the past 3-years with no hint of this problem.

Two other bateries set up with exactly the same Dean's connectors do not exhibit this problem. (However, they are newer)

I have no way of telling which + or - (or if both) terminals are loosing their connection(s)

I can't take a photo and, yes, trying to describe how to apply the pressure is difficult to put into words.

Sooo; here goes my best attempt: Take the female connector and place it on a flat surface with the horizontal terminal on the bottom and the vertical terminal on top. '

All of my battery connectioins have the positive lead connected to the horizontal terminal and the negative lead connected to the vertical terminal when viewed as described.

Now, if you keep the female held firmly in this position, plug in the male connector with some type of visible load and then apply a little (it doesn't really take much) pressure to either side of the male connector, the electrical connection breaks. Or, to put it another way, if you hold the wider sides of the connectors between your thumb and forefingers and apply gentle pressure side to side, the electrical connection breaks. The pressure is applied the same way you hold a stick that you were trying to break in two, BUT GENTLY.

If I apply a rocking pressure to the connectors (I can't even detect any movement of the connection) when hooked up in the planes, the ESC will continually kick in and out.

I don't dare fly any of these planes while they exhibit this intermittent behavior.

Thanks again for the interest.

Respectfully, Al