What would happen if I used a 1S 25C battery to replace the 20C battery for the helicopter? It's a different li-po battery with 3.7 volts.

No issue, more punch. I have a 45C in mine. Flight times not as long but it moves quick.

So you know if I buy two helicopters if I can change the channel they are on so I can fly them together or will they crash when I try to fly them?

i dont think you can you can bind two heli on the new syma s107 that are different chanel but you cant change chanel change the board for new chanel they will fly in sync just space them apart

Is the battery on board the helicopter replaceable?

It is replaceable, but it requires some skills and knowledge. You'll need a mini Philip screw driver a way to strip the rubber from the wires. I recommend using electrical tape and not scotch tape to seal the wires together when you get a new battery. I recommend buying "10 pairs JST Plug Connector RC Lipo Battery Male/Female" and connecting the wires to these, so the battery can easily be replaced each time it begins to stop holding a charge. Also, if you strip the yellow cable and connect it with a female connection, you'll be able to charge the battery MUCH quicker then if you would the normal way. I'm talking 5-10 minutes instead of 30 minutes. The yellow cable will still work the same with knowing when to stop charging. Plus you can use other r/c li-po batteries that uses 3.7 volt, but because the manufacturer is different, the quality can be so much better!

I also flew mine outdoors, on a calm night. So dark, I could only see the flashing LED's. I was amazed how high it would climb. Once it reached a certain height, I didn't seem to have much control of it. The slightest breeze would send it into the neighbors yard. It may seem odd, but I think the sun light affects the controls. During the day, I'm lucky if I can get it 2 feet off the ground for no more than a few seconds.

Material Type	Aluminum
Color	Red
Toy Vehicle Form	Helicopter
Theme	helicopter
Item Weight	227 Grams
Size	Mini RC Helicopter
Item Dimensions	7.5 x 7.5 x 7.5 inches
Unit Count	1 Helicopter
Are Batteries Required	No
Power Source	Battery Powered
Number of Batteries	1 Lithium Polymer batteries required. (included)
Supported Battery Types	Lithium-Ion Polymer
Additional Features	Flashing Light

SYMA

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