Battery ignorance….

[scalpel_ninja]

View attachment 65314
Top battery doesn't say but other two say it on the case.

Those are all lithium ion batteries. If they are a different chemistry and are cylindrical, the wrapper will usually state LiFePO4 (which is really the only other common chemistry in the cylinder shape) and a nominal voltage of 3.2V instead of 3.7V.

 

[aznsx]

If you want a high quality, but basic, and very inexpensive DMM, I recommend Extech. That's what I use 'at home'. I think they start here, and go up in function / price from there. This would meet your needs cheap, with some quality, and a good U.S. company behind it who really knows electronic test equipment and has a track record:

Extech MN35 Mini Digital Multimeter, 600V AC/DC

The Extech MN35 Mini Digital Multimeter measures AC and DC voltage to 600V, DC current to 10A, resistance up to 20MΩ, and temperature to 1400°F. It features resistance, continuity and diode testing. A data hold function will keep measurement reading locked in the display. The tester also...

www.specialized.net

 

[MidnightDistortions]

View attachment 65314
Top battery doesn't say but other two say it on the case.

Top one appears to be Lithium Ion (21700). I would definitely make sure to note which batteries are what and keep all your Lithium Ion (Li-Ion) cells together. Also helpful to know the purchase date (ideally a manufacturing date, but not always listed on the batteries) so you can keep track of how old they are.

 

[KITROBASKIN]

Top battery is labeled INR; that is lithium chemistry.

 

[knucklegary]

If you want a high quality, but basic, and very inexpensive DMM, I recommend Extech. That's what I use 'at home'. I think they start here, and go up in function / price from there. This would meet your needs cheap, with some quality, and a good U.S. company behind it who really knows electronic test equipment and has a track record:

Extech MN35 Mini Digital Multimeter, 600V AC/DC

The Extech MN35 Mini Digital Multimeter measures AC and DC voltage to 600V, DC current to 10A, resistance up to 20MΩ, and temperature to 1400°F. It features resistance, continuity and diode testing. A data hold function will keep measurement reading locked in the display. The tester also...

www.specialized.net

The Extech looks like a winner!

 

[KITROBASKIN]

If you want a high quality, but basic, and very inexpensive DMM, I recommend Extech. That's what I use 'at home'. I think they start here, and go up in function / price from there. This would meet your needs cheap, with some quality, and a good U.S. company behind it who really knows electronic test equipment and has a track record:

Extech MN35 Mini Digital Multimeter, 600V AC/DC

The Extech MN35 Mini Digital Multimeter measures AC and DC voltage to 600V, DC current to 10A, resistance up to 20MΩ, and temperature to 1400°F. It features resistance, continuity and diode testing. A data hold function will keep measurement reading locked in the display. The tester also...

www.specialized.net

Looks like those multimeters are made in Hong Kong or Taiwan.