The negative terminal of the battery is supposed to be connected to ground but it isn't uncommon for resistance in the circuit to cause a tiny voltage to develop at the connections. I wouldn't be terribly concerned about anything less than 100 Mv.
BTW: Voltage is not a "current reading". Voltage is the electrical equivalent of pressure and current is the rate of flow of electricity through a load.
Before you try to measure anything with your meter it is a good idea to learn how meters do what they do and how to use them. I strongly recommend studying this page about the various types of meter (voltmeter, ammeter, ohmmeter) and then moving on to the section on multimeters linked at the bottom of the page to learn about how to use a meter that combines the types in one case
electronicsclub.info
If you are unfamiliar with things electrical it is probably a good idea to go through their page on how series and parallel circuits work, followed by the section on voltage & current linked at the bottom.
electronicsclub.info
BTW: Voltage is not a "current reading". Voltage is the electrical equivalent of pressure and current is the rate of flow of electricity through a load.
Before you try to measure anything with your meter it is a good idea to learn how meters do what they do and how to use them. I strongly recommend studying this page about the various types of meter (voltmeter, ammeter, ohmmeter) and then moving on to the section on multimeters linked at the bottom of the page to learn about how to use a meter that combines the types in one case
Meters, voltmeters and ammeters | Electronics Club
Learn how to connect and read voltmeters and ammeters, both digital and analogue types.
If you are unfamiliar with things electrical it is probably a good idea to go through their page on how series and parallel circuits work, followed by the section on voltage & current linked at the bottom.
Series and Parallel Connections | Electronics Club
Learn what the terms series and parallel mean in electrical circuits.
