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T-REX 500 › Current draw when connecting battery to ESC
03-14-2010 12:57 AM  8 years agoPost 1


Broken Arrow, OK.

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I've been out of the hobby for almost 10 years (nitros only) and just built my first electric the T-rex 500ESP. When I plug my 6S pack into the ESC it sparks like there is a current draw. All components are plugged in, eg. receiver,gyro,servos. Transmitter is off. Motor is disconnected. Is this normal? I'm used to having an on/off switch on the heli. Thanks!

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03-14-2010 01:02 AM  8 years agoPost 2

rrElite Veteran


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yup it will spark every time u plug it in

03-14-2010 03:57 AM  8 years agoPost 3
Heli Bob


Puerto Rico,Carolina

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feel the power.

Beam E4(md-500e),Gaui 200,T-Rex 500,E-flight MCX.

03-14-2010 04:12 AM  8 years agoPost 4
Evan D


Charlotte, NC

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I would think you'd want to know why it does it too... If you look at the ESC there are big capacitors to regulate the input power into the ESC, these are pasically a short and need to be charged up to regulate. This short causes the spark you see when you connect the battery. If you connect with a spark and then disconnect and reconnect there shouldn't be a spark. Some people say that the spark is good, if you se it you know everythig is good. That's very simplistic but fairly true.

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T-REX 500 › Current draw when connecting battery to ESC
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