Who has used one of these cheap ebay battery monitors?
I have one that I bought like 8 years ago, kinda surprising to see the same style still being sold. The big issue I have with it is that it can't tell the difference between current flowing in and out of the battery, the reading is positive no matter what.
I wonder if I just got a buggy one? Can't find any real info on whether they're supposed to indicate positive and negative current. Seems like an essential feature.
I need a battery monitor that can tell me if the battery is charging or discharging, and give an amp-hour reading that can count up and down as the battery charges and discharges.