What battery supply would it be a good idea for me to use for a little project?

[brianadin]

I'm making an undertaking that goes on the client's wrist, and I'm considering what sort of battery supply I ought to utilize. It should be minuscule. I attempted 2 CR2016 3V batteries, it was enough for the arduino to power and run code, yet it wasn't enough for all that to appropriately work. I'm anxious about utilizing Lipo Batteries since they are hazardous and can detonate. Any ideas for a little and safe battery supply?

Speed Test xender snaptube

[LubOlimex]

You know smartwatches use Li-Ion and Li-Po batteries. Like even Apple use Li-Ion batteries:

https://images.macrumors.com/t/6650VpiAoj9moT8qjYcvWohD1_U=/800x0/article-new/2021/10/ifixit-apple-watch-teardown-1.jpg?lossy