I bought this juntek and I must say that it does its job well, the Volt and Ampere readings are very precise, and the wireless mode is also convenient … but there are an point not good:
I use juntek to test the capacity of my lithium battery packs, I run the discharge until the BMS inside the battery turns off the output, when this happens the juntek unit inevitably turns off, this causes the loss of memory and I lose data of my descharge
I thought of supplying the unit with an additional voltage in addition to that of the battery) on the GND and VXT pins but there is a conflict as the battery voltage is present on these ports.
So the only alternative is to install the relay and insert a cut-off of (minimun voltage descharge) higher than that of the BMS board inside the battery,
but this unfortunately will not give me the total capacity of the battery