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KIlled the battery?
Tags: Syma X9
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mamiata1
SE Michigan
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November 16, 2011 - 11:20 am
Member Since: November 4, 2011
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I get maybe a minute of flight time and then it settles to the ground and just spins. Thinking the battery worked similar to a Ni-Cad I tried totally discharging the battery and then recharging. I can't remember if this was when I first noticed the issue BUT since then I replaced the battery and have the same issue. New battery is slightly larger (and therefore heavier) but I don't believe it is the extra weight holding the chopper down. I still have a spare battery I can try. Any ideas?

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Syma Freak
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November 16, 2011 - 5:08 pm
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@mamiatal1 Are you saying you discharged original lipo battery in heli? what battery did you replace with,consider cgi center of gravity,a lot of people have converted to Dales battery mod give us more info on what battery you are changing to-talk soon

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

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mamiata1
SE Michigan
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November 17, 2011 - 1:49 am
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Yes, I completely discharged the original battery and I think I might have done the same with the replacement. My son ordered these batteries through EBay and they came from China. All I can tell you is that they look like the original battery (and were marketed as direct replacements) but are about 1/3rd bigger. They are marked as 240mah and 3.7V 2OC. It was quite a struggle to fit the battery within the copter shell but with effort they do barely squeeze in.

 

At this point we still have two fresh batteries left and I plan on soldering in a new one and charging before trying to fly and then I will not let the battery ever completely discharge. Wish me luck. If all else fails I have another S107 on the way that I found through Amozon for only 22 bucks with free shipping and this one becomes spare parts.

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Syma Freak
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November 17, 2011 - 7:20 pm
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The factory battery is for Syma S107-19 Li-polymer Battery (3.7V 150mAh) not 240mah  link here for info they are bigger and can cause center of gravity problems

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

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mamiata1
SE Michigan
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November 18, 2011 - 2:35 am
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Well, Maybe but I'm beginning to think the gears are slipping. Sometimes while attempting to launch the lower blades do not spin and even when they do the rudder trim is all the way to the right and the copter still won't hover without minor spinning. I have replaced all three gears that are replaceable but have not found replacement parts for the tiny gear on the motor shaft.

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mamiata1
SE Michigan
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November 18, 2011 - 11:31 am
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I got a post that Syma Freak replied to my post and yet I see nothing. Am I missing something?

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Syma Freak
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November 18, 2011 - 3:05 pm
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@mamiata1 repeating post,did you get this one ok?

The factory battery is for Syma S107-19 Li-polymer Battery (3.7V 150mAh) not 240mah  link here for info they are bigger and can cause center of gravity problems

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

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mamiata1
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November 19, 2011 - 6:04 am
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I got that one as well as the original but I thought there was another in between. Anyways I hear what you are saying about the CG but the fact that it flies fine for a minute or two leads me to believe this is not the problem. Also I weighed the original battery and it is about 4.5 grams whereas the new battery is about 5.5 grams so really not a big difference.

The fact that the rudder trim needs to be all the way right and the copter still slowly rotates makes me think the lower blade is turning slower than the upper blade most likely due to gear slippage. The only gear left to change is the one directly on the motor shaft and I believe from what little research I have done is that the motor (with the gear) would need to be replaced as the gear is not sold separately.

Oh and I've pretty much ruled out the battery being discharged as the copter will act as a hovercraft for several minutes after losing altitude.

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