I'm not sure if this is the right place to post this but if anyone can provide any help it would be appreciated. Please keep in mind I am no expert when it comes down to power and electrical stuff
I am working on a project (Making a costume) that will require the use of fairy lights also known as string lights. The project I'm working on requires 16 separate strings and each string has its own small battery pack which contains 2 cr2032 3v batteries and a on/off switch. So a total of 32 cr2032 3v batteries
These are the lights I purchased.
So for testing purposes I tested this with 4 fairy lights and 1 9V battery. Note I have tried wiring 2 strings to 2 AAs and the brightness was not there. Not to mention having to carry around 32 AAs would be a bit tedious. Attached is an image of how I wired it up in series and parallel. 
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Series wiring – LEDs would not light up
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Parallel wiring – LEDs would light up however the battery slowly started getting hotter and hotter.
My question is, what would be the easiest way to wire all of these into 1 switch safely. Please keep in mind that this will be part of a costume so I'd like to keep weight down to a minimum. Note that carrying 4 9V batteries is alot ligher than 32AAs. I'm just not sure how I would wire them. And if resisters are needed, what size and where would they be inserted?
New Image wiring:
Best Answer
The 2nd is correct, all LEDs in parallel. Two CR2032 make 6V. Use a 4AA battery pack to drive the LEDs. Put the switch in series between the battery+ and the LED+.