I'm building a small device based on ESP32 and powered by a 5V power supply (looks like <1A even when speakers are playing). I want to power it on batteries and it seems that everyone does Li-Ion batteries today (at least those are almost all the tutorials I find), but I'm a bit concerned as I know that these are more prone to explosions, catching fire, etc... Since the toy won't be used during the night, and for convenient, I thought to charge the battery via a wireless charger, although I know they provide slightly less current (I can charge slowly, I have the whole night..).
- What type of battery would you use for a baby's toy? Are Li-Ion really dangerous or I'm looking at old posts?
- I saw the Li-Ion batteries are 3.7V. If I connect 2 of them I'm over 5V already.. How can I get to 5V with those? Do I need some voltage regulator?
- Is there a recommended (and reliable!) charging module? Ideally with all other components needed if any?
Thanks!