SparkFun makes good products and has great documentation. When SparkFun designs a product and makes PCB details public, it doesn't surprise me that other companies copy it. As long as the others use real Linear Tech parts, there's no reason to think it won't work. And at half the cost. SparkFun products are usually red in color and have their logo on it. All 13 of mine work.
SparkFun ships its version with the SJ1 jumper shorted, these arrived with it open. SJ2 and SJ3 are open on both. Here's an important note. With SJ1 open, you can control when the interrupt line is cleared by asserting the \CLR control line. Unfortunately, removing S1J also removes a pullup from the \CLR line, but there is still a pulldown. If you have a weak port, such as on an I2C expander chip, you might not be able to pull the line high enough. Therefore add a 3.3K pullup of your own on the \CLR line.
If you want to put a connector on the "OUT" location, look at https://www.amazon.com/dp/B07V69GRZ2?psc=1&ref=ppx_yo2ov_dt_b_product_details. Its a JST 2.0 PH 2-Pin connector. You may not need 50 of them but you get the idea.
I couldn't find a mechanical drawing, even from SparkFun. So I've attached one based on my own measurements and then making my own PCB. Its a good fit.
The Linear Tech part can consume up to 140 uA by itself. You can quickly calibrate this out by connecting a stable, clean source to "IN", and a known load on OUT. For instance an 18650 lithium battery (3.7V), followed by a 3.3V LDO and a 33-ohm load. This will consume around 100 mA. Take accurate measurements on the 3.3V and the 33-ohms to obtain an accurate current calculation. Measure the durations between many consecutive pulses, then do the math to obtain the mA/Hr number. Subtract out the 100mA/H and the Linear Tech current is what remains.
But if you have time, you don't need to put a load on "OUT". The Linear Tech's Vdd is connected to the "OUT" side of the sense resistor. If you wait long enough, it will generate a pulse that represents its own current consumption. You should measure the time between a few or more pulses to get a better figure.
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