I have a battery that states a 2.75v battery discharge cut-off voltage. Is that voltage measured at the poles of the battery while it is connected to the load or they are talking about the electromotive voltage?
For example. A Sony battery I have, when I measure it with a multi-meter it displays 3.61v EMV but when connected on the load it only gives 1.81V at the poles of it. Which voltage I should consider to stop discharging it?
Why such a large difference in voltage?
EDIT: Since you asked, the battery is a Sony US18650GR - O7. It is connected on a custom made circuit with 2 parallel 4.7ohm (5 watt) resistors (2.35 in total) plus some mOhms (maybe 0.5-1 Ohm) due to cables, shunt resistor (current sensing) and connectors resistance. At start it draws something like 1.2 Amps and when the voltage dips at something like 1.81v it draws 600-700 mA. No cut-off (over-discharge) circuit.