Lithium charging board cable distances

Other Hardware General Electronics
1

I have a lithium charging board which takes input through usb type c and charges a lithium battery as well as providing 5v 2a from an output to a ws2812b led light.

If i need to make this board connect to a ws2812b 5v led light over a long distance I have 3 options

  1. 2.5 meter / 8 feet long cable between the battery it charges and this board and the board output is connected to ws2812b at that point.

  2. the board is connected to the battery immediately and then between the boards output and ws2812b connection there is a 2.5 meter long cable

  3. 2 meter long usb type c cable connecting to the board, and the board is connected there to ws2812b and battery.

Which is the ideal choice here? Is there a better choice?

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2

Number 3 is the best because the others you will have to make.

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3

What about voltage drop in 2.5 meters? Would it possibly effect the charging of battery to the point that it doesn't charge?

4

Voltage drop will depend entirely on the current through the cable. And that will be what?

5

Don’t forget unless you have a clever charger , you can’t charge and run the load at the same time .

6

Here is a wire gauge chart.

For example, 16 gauge wire has 4 Ohms over 1000 feet, so that's 0.04 Ohms over 10 feet.

Then you can use Ohm's Law to calculate the voltage drop (loss) for a given current. 2 Amps * 0.04 Ohms = 0.08V (80mV). That's probably OK, but you'll also lose some voltage through the connections (solder connections, screw terminals, connector plugs, etc.).

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