The transmitter has a diode in the charge circuit. You can't get a reliable ESV rading through the charge jack. (you also can't do a good fast charge with a peak detect charge through that jack.)

If you want to get an ESV reading on the TX... pull the battery out of the TX. Use the RX cord. The black wire on the battery is the same as the black wire to the ESV (or the quick charger) the RX cord should fit the TX battery (but use the TX jacks on the ESV and charger...)

Never fast-charge a TX battery in the TX. the battery can't get cooling airflow and culd overheat. This can vent the battery or explode it. Either ruins the battery and can ruin the TX.

I have no idea why they don't just give you two RX cords instead of an RX and TX cord with the leads package... you essentially never will use that TX cord for the ESV or the quick charger. [&:]

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Your experience with the SPAD... you were climbing too fast for the airplane... it stalled dropped the nose and never got back enough airspeed to fly before it hit the ground.

Your balsa/ply trainer can do the exact same thing.