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Hello - any ideas why power is pulsing? What voltage should we have across battery?
S107 isn't flying! Battery seems to have voltage. Power pulses and then stops.
Tags: Syma X9
Syma Freak
May 14, 2014 - 1:54 pm
Member Since: November 26, 2010
Forum Posts: 1438
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JamDJ and CPD thank you for the post

"Fly like a butterfly sting like a Syma" http://syma107.com

May 13, 2014 - 5:10 am

Thank you very much for your thoughts and advice.  🙂    We will try to be better S107 owners in the future!


Lancaster, PA, USA
May 8, 2014 - 3:19 pm
Member Since: February 14, 2012
Forum Posts: 255
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Beanreid, Greetings and thanks for joining our forum! Just going down your question list to help you....

Yes, the correct voltage is 3.7 so your reading is correct, only problem is it sounds like he fried the battery

so the voltage may be correct but the amperage may be off for the following reasons......

First of all, yes when the red light comes on, it's fully charged. Sorry there is no cut-off point and it will

overcharge if you leave it plugged in overnight, causing damage to the battery. Generally an hour or

so is enough. If he does not fly it immediately, after the 15 minute wait, that's OK because the battery

will keep it's charge. 

Second, yes, the 15 minute rule is important. Don't fly for 15 minutes after charging, and wait 15

minutes after a flight to begin recharging again. This gives the battery a cool-down moment.

Third, you said on your post he left it in the sun. OK, another bad idea, this tells us he was flying

outside which the 107 was not meant to do. The remote control works off of light waves as opposed to

radio waves, thus the term IR remote RF remote. The only catch to IR remotes is that they can interpret

ambient light like reflections from mirrors, TVs, Christmas lights, etc, new LED bulbs as signals for the

helicopter to act differently than the remote is telling it to do.

Fourth, you asked why you didn't know this before.....well, we all made the same mistakes, plus the owners

manual is pathetic in Chinese translation and no 8 year old reads it anyway. Thus the reason for this forum.

I agree with CPD in saying the battery is fried, but not the end of the world.If you want to get a new battery

and soldier it in, it's an alternative, however.......

      Liz, my best advice would be to get him  a new one and teach him the responsibilities I mentioned  above.

The 107 is a great learning heli a lot of fun. Just keep the old one for parts, if needed.

We are all here to help you so keep  us posted!!!!!

May 8, 2014 - 2:09 pm

Open er up, and look at the battery. If it looks bloated and not right, well, the battery is dead. You can get a new one and solder it in, but there's a number of issues with them, since a lot of times they don't maintain them, and you just get a new old battery just as dead as the old one. Look for one on Amazon or something.

May 7, 2014 - 9:23 am


My 8 year old son loves his S107, and I think he's pretty good at flying it too.  Today he told me it wasn't holding charge and he couldn't fly it.  I have tried to look into what's wrong but I have got stuck.....


When he tries to fly the chopper it will go up for a few seconds.  Then it goes down to the ground as if it doesn't have enough power.  Then the power to the blades kind of pulses stronger and weaker for a bit (roughly 1 second frequency to the pulses), then the blades stop rotating altogether.

When we put it on charge the red light comes up immediately on the usb charger in indicating that the battery is not being charged (is it charged or faulty?).

The voltage across the battery is 3.74 V 

Firstly I have to admit we have not treated the battery right.  It gets charged immediately after its been flown.  It gets left on the charge all day (I had assumed the charging would stop when the red light came on).  It gets flown immediately after charging.  Oh yes, and we fly it until it won't fly any more, and then leave it in the sun.   I had no idea at all about lipo batteries, and now I realise we have done just about everything wrong with it that is possible.  How did I not know all this before? 


Thoughts please - have we fried the battery?  What should the voltage across the terminals be? 

Many thanks for you patience with a novice!

Liz smile

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