Hi,
I'm not sure it's a real tip but maybe could be useful for somebody.
I've built a device to listen music using 18650 batteries. To charge the batteries I use a TP4056 charger manager. This TP4056, through two MOSFETs, interrupts the energy to the set player+amp when the batteires voltage gets low (I guess near 3.4v, 3.5v...), then the radio stops playing. But as the batteries are not required more, even without recharging it, it recover a little charge by itself (I believe). And the TP4056 MOSFETs turno the radio on again. And as soon as the radio is turned on, the batteries got low charge again and the TP4056 again turn it off.
This issue make the sound device become on, off, on, off several times at the end of the batteries charge. It's not awsome when it ocoours near I'm getting sleep at night. But it could be worst if the application is more important or critical than a sound gadget, so I'm bringing the solution I've got:
When the batteries turn off the set player+amp, it turns off too a flip-flop key, wich only can be re-turned on pressing a button. This flip-flop is based in a CI called 555.
Here the story of the sound device, the solution I've got from a brazilian forum and the original flip-flop scheme:
https://rmlazzari.wordpress.com/2018/01/14/para_ouvir_musica/http://www.bowdenshobbycircuits.info/page9.htm#555-T.gifhttps://www.clubedohardware.com.br/forums/topic/1290420-como-criar-chave-stand-by-liga-desliga/Please excuse the brazilian english, reply if I got misunderstood and hope this could be useful.