Yep, you were right.
When the motors starts, program starts rebooting. What can i do for it? Reduce the external battery voltage?
What types of batteries do you have now?
Voltage should match your motors. Most ebay ads for those says 3-6V.
Even if you run motors on low speed they will get full voltage, as power is applied in pulses (PWM)
2 cells LiIon 18650 in series is 7-8 volt and should have no problem deliver current needed.
Another solution is to have separate power to motors and system.
So i have to use only that much voltage that motors need?
Here's the platform with motors - in the description below they say that they need maximum 6V. I used 8x 1,5V alkaline power battery AA from Philips. I though that i can use higher voltage and board will take only that much voltage that needs.
I searched in my desk some batteries, and have found 2 batteries from the head lamp - each Li-ion 18650 8800mAh 3,7V.
How can i separate power? Using separate 6V to the engines port on the board, and for example powerbank 5V to the usb?
Anyone? Please?
Cease and desist with the videos if you want help. Instead, please provide proper schematics and clear photographs. Attach them to your post, don't use offsite links.
Yes but since i have posted this post we have already solved some of the problems, and another just appeard. Do i have to modify the whole? Read last answers cuz there is completly description for all of the problems.
USB power bank to the system and 4x1,5V battery to motors are good. In that way system gets a stable power source. You could also get a battery holder for 2 pcs of 18650 to get ~7,5V. I don´t think it will damage the 6V motors. Battery holders can be bought cheap on ebay, or that polish site.
Those batteries you have, they are not 8800 mAh. Roughly 3500 mAh is the most a 18650 can hold.
I have 4 battery holders for 8x AA batteries. So Either i use 4x AA 1,5V or 2x 18650? Is there a way to don't use powerbank to usb port? Is this Green Port on the board accountable for ONLY motors power or motors power and the board system power? There's not much room for a powerbank so i would not use it
I have successfully used 2x18650 but my robot only had 2 motors. (Most) Li-ion batteries can supply plenty of current without voltage drop. In that case you can have switch to ´on´ and only need a single power source.
You have a few power options listed at DFRobot.
Switch ´off´, separate power source.
5V to either USB port or 5V pin, or 5~23v power source to VIN.
I'm back with project.
5V from usb when "OFF" is set and 6V from batteries is an option. But why when i connect 10V from batteries to this port and set "ON" program keeps reseting? And what's going on with this "Vin" thing. I can see "Vin" port on my board, but i hadn't connected to this single wire.
Board reset because of unstable power.
Vin is parallel to power jack (on ordinary boards). Input power that goes to a voltage regulator. Your board is missing the power jack as you have a screw terminal instead (when switch is on).
If you separate power with the switch, you can still feed 6 to 23 volt to Vin, to power the system.
Sorry, but i'm not completely sure if i have understand you. Imgur: The magic of the Internet - here's photo of my board. First green port from the right top is Motors and System Power. If i switch it on "OFF" it feed only motors, when "ON" motors and system. I tried to connect 10V battery and i have the same problem when i switched it "ON". I don't know how to us Vin port which is first pin from the RED PIN TOP.
But how can i seperate power (Motors and board)?
that's where and what to connect on the board* - not exactly mine
I connected 2x 18650 3,7V batteries (around 6V together when i checked this) and i still have this problem. Board keeps reseting
Hi,
Can you post a circuit diagram of your project please, hand draw and post a picture.
Not a Fritzy picture you have supplied.
You seem to be doing all sorts of different things to fix your problems without any logical thought.
Where do you connect the battery you use to power the control board when you remove the USB?
Thanks.. Tom.. 
I'll send you picture in 10-15 minutes. Thanks
It's not the preatiest schemat but there it is.
VCC from the sensor is connected to a 5V n board not VCC. Becamue i watched some tutorials, and that's how it was connected. Motors are connected to a green motors pin on the right.
Did it help you solve the problem?
TruePatrick:
I connected 2x 18650 3,7V batteries (around 6V together when i checked this) and i still have this problem. Board keeps reseting
Sounds like they need a charge. 3V from a Li-ion is almost empty.
When i measure it on multimeter it shows 5,91V. On the batteries writes: "The voltage of full charge and empty condition is 4,2V and 2,75V"
I will charge it.What do you think how much time it would to charge it fully?
And how types of batteries can have influence on the board?
Hey UPDATE here. I charged my 2x 18650 batteries. Not full but voltage reaches 7,36V. I connected this to a board and switched the switch "ON" that board and motors use voltage from batteries. Seems that all is working correctly, BUT sometimes board reset but on very short time. I will chage it fully and keep your raporting, if it's good now