No knowledge of circuits or basic electonics - MP3 player, how to make direct connection without charging the battery, what voltage adapter does it require to run : r/PCB
Putting Christmas music in American Flyer S gauge car | O Gauge Railroading On Line Forum
3.7V 120mAh 402020 382020 Lithium Polymer li ion Rechargeable Battery For Mp3 MP4 MP5 GPS mobile bluetooth - AliExpress Consumer Electronics
402020 3.7V 160mAh li Polymer Li ion replacement Battery For bluetooth headset mouse Bracelet Wrist xiaomi watches clock|li-ion battery|battery for bluetooth headsetrechargeable li polymer battery - AliExpress
Fixing a Cheapo Chinese MP3 Player : 4 Steps - Instructables
3.7V 120mAh 402020 Lithium Polymer LiPo Rechargeable Battery cells For Mp3 DVD PAD mobile phone bluetooth headphone|for mp3|3.7v 120mahlithium polymer cell - AliExpress
3.7V polymer lithium battery, 402020 MP3 MP4 small speaker, Bluetooth battery, small toy mouse Rechargeable Li ion Cell|polymer lithium battery|bluetooth battery3.7v lithium polymer battery - AliExpress
Mini MP3 Player, € 5,- (1200 Wien) - willhaben
Схема для MP3 плеєра, ціна 30 грн - Prom.ua (ID#1357300777)
Mini C Shaped Operation Pad MP3 Music Player Ñ Clip + 8GB TF / Micro SD Card - White M-32451 : Amazon.in: Electronics
Speakers & Players, buy Factory Price MP3 Player with USB, Mini Clip MP3 Player Manual, support TF card MP3 player on China Suppliers Mobile - 110840177
Mini Ipod Lettore Mp3 Memoria espandibile - Audio/Video In vendita a Crotone