Universal phone battery charger

thingiverse

<h1>Universal phone battery charger</h1> Help charging any size 3.7v phone battery without phone. Parts: - Screws & nuts - M3 - 2x steel rod from old CD writer - 2x 3mm Leds with holders - [Pins](https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20180805175012&SearchText=P50-B1+Dia+0.5mm+Length+16.35mm) (D 0.5-0.6mm Length 16mm). - [Charger TP4056 w Protection](https://www.aliexpress.com/item/Free-Shipping-10pcs-lot-5V-Micro-USB-1A-18650-Lithium-Battery-Charging-Board-With-Protection-Charger/32489196709.html) - [Digital Voltmeter Ammeter DSN-VC288](https://www.aliexpress.com/item/DC-0-100V-10A-Digital-Voltmeter-Ammeter-Dual-Display-Voltage-Detector-Current-Meter-Panel-Amp-Volt/32695139906.html) Shematics: - [Reverse polarity protection](https://easyeda.com/Atiesh/Universal-phone-battery-charger) - [Connetion shematic](https://easyeda.com/Atiesh/Universal-phone-battery-charger) p.s.: - Mosfet in protection board must be "Logic-Level" with very low RDS(on) - Tp4056 module have special resistor to limit current.. im not change it.. by default is 1.2a