Antrader 20 Pcs 3V CR2032 Horizontal SMT Coin Button Battery Holder Brown Container Case Plastic Housing

this is what they look like when you when it comes um i'll probably give a link to the seller as well these took kind of a long time to get to my house but i always wanted to show you what they look like and i also bought this i don't know what type of project i'm going to do with them but these are um these are some cheap battery holders so i'll open up one of them and i'll show you what's inside uh so you can see that there's like an on off button here it comes with these uh lead wires as well so uh they flip open like this this is where you put the battery but i wasn't sure if something um are they in series or in parallel so i'm gonna find out today i'm gonna take out my voltmeter i'm gonna put two batteries in here and we're just gonna do a little bit of a test to see uh what's what's the voltage of two of these batteries is in series or in parallel so this is what i bought earlier