RC India

Dont know if this question fits here or not but I need some help.I am actually building an RC truck using fs-ct6b and connecting a battery to R6B receiver externally
I have 2 batteries 4v-1Ah and 4v-1.5Ah.my question is what is the current capacity of this receiver.can I connect 1.5Ah battery to it?

Typically most recievers run on 5v BEC.
And those BECs can take up to 3A or so.

Aah, I fear neither the question nor the answer is correct.
There is nothing like ‘current capacity’ of the Rx.
The Rx is rated for a certain voltage (typically 4.8 or 6 v) More than that voltage will make it blow.
As long as the voltage is right, the Rx will draw whatever current it needs (typically far below 1amp)

The 1ah and 1.5ah you mention relates to thecapacity of the battery.
The second will last 1.5 times as long as the first one.

But I find it odd that your battery is of 4 volts. What kind of battery is it?

Request other members also to give inputs.

Sir, it seems we connect our servos directly to the Rx, so , it may draw more than 1 Amp at full load if suddenly all 4 servos are activated.

So, my concern is are there any limits to the current transfer capacity of the Rx ?

Any things regarding load on the Rx we should be concerned about here ?

Thanks and regards

Power connections in receivers are usually wired parallelly.
Which means that all positives and all negatives are wired parallel on the PCB. Your question regarding the power handling is correct as the power to the servos would flow from the Rx PCB only which may not be able to handle huge currents or surges. In such cases Power Boxes are used, where the power to the servos are drawn directly from the batteries bypassing the receiver but the signal flows from the Rx only.
I would say anything more than 3 Amps on the receiver PCB would be on the limits. So if you are planing to powering heavy servos, either use a power box or bypass the power from the receiver.

Precise and accurate answer Saurabh

Thanks, saurabh sir, this information is golden knowledge.

While searching for a powerbox , I found quite a variety of items. But none match with the discussion. Is such a powerbox even commercially available ?

Thank you Mr.sourabh....helped me alot :)

You all are welcome.
If you are unable to find a power box for your system, you can wire it up yourself. If you have a heavy duty servo that draws large current, just connect the positive and negative of the servo lead to the power source (2 cell lipo) directly and plug in the signal wire only to the Rx. Remember, that there should be a common ground between all the devices including the Rx.

So technically you are just bypassing the receiver for the power supply to the servos. You can have multiple servos connected like this to your battery. All positives and negatives of all servos connected parallel directly to the power source and only the signal wires to the receiver. The receiver should have a common ground with the power source. (Usually it does)

Absolutely right, KK Iyer.
The Flysky receiver normally takes a few hundred (300-400 mA) during normal 4-channel operation (RC airplane) as measured by me. The specified voltage is between 4.8V ( 4 x NiMH rechargeable cells of 1.2V each) to 6V (4 x dry cells of 1.5V each).

I have a sealed Lead Acid 'SUNCA' rechargeable battery (very small, cute and reasonably light, capacity 1 Ah) which I sometimes use to test my receiver with servos. It works , but I never installed it in airplane. Use it mostly for glow-ignition purpose.....

These SUNCA batteries are available also in 6V, 8V and 12V range - getting larger and heavier... My SUNCA battery is 4V, 1.0 Ah.

Yeah, I usually use 6v receiver battery (https://www.ovonicshop.com/products/ovonic-2000mah-6v-5s1p-nimh-battery-for-rc-car-airplane-receivers), because this is the most commonly used, it can also be used elsewhere