Safely power motors from 7.4v lipo

Projects General Guidance
1

I have a 7.4v Lipo battery from an RC car (Wltoys 7.4V 1500mAh), with a charger. I would like to use this battery to power an Arduino car. My main concern is to disconnect the battery when the voltage goes too low, to protect the battery.

I have found these inexpensive overdischarge protection circuits online (no affiliate links):

  1. https://www.aliexpress.com/item/32810031969.html

States: discharge voltage range: 2.5 + / - 0.05 v to 3.0 v

  1. https://www.aliexpress.com/item/33019363588.html

States: Over dishcarge voltage: 2.5-3.0v±0.05v

  1. https://www.aliexpress.com/item/32822540730.html

States: Over Discharge Detection Voltage: 2.3-3.0V±0.05V

They all sell for under $1, so of course I am wary. Are these devices reliable? If not, which devices should I use. I live in the middle east where deliveries from the US and Europe are obscenely expensive yet the Chinese are able to deliver for free.

2

Should be ok...depends on your current demand as to which unit you select.

90% of products these days are Chinese and most electronics are reasonably reliable.

You may find you battery pack already has a protection circuit built in.

3

bluejets:
You may find you battery pack already has a protection circuit built in.

Is there any way to non-destructively test that?

4

Use a low value, high wattage resistor to draw a known overcurrent, and see if the protection circuit trips.

5

dotancohen:
Is there any way to non-destructively test that?

Read the data sheet of your battery pack.

6

wvmarle:
Read the data sheet of your battery pack.

There is no data sheet, the pack came with an RC car. I actually am from the early-2000's RTFM Linux crowd, though!