I bought a 9V Lithium cell primary battery (single use battery, not Li-Ion rechargable like in cellphones). I suspect it might be old or not in good condition. To test it I hooked it to 500 Ohm resistor and measured the output voltage: No Load Vout = 9.8V Loaded Vout = 9.5V and reading drops by ~10mV every 2sec After the first test the battery reading changed again: No Load Vout = 9.55V Loaded Vout = 9.29 and reading drops by ~10mV every 2sec
Is this a normal behavior for battery of this type ?