18650 x 2 Battery Bank

thingiverse

The necessary non-3D printed parts include: 1 x High-Voltage Micro USB Lithium Battery Charging Board [refer to note below] 1 x Adjustable DC-DC Converter Module, boosting input voltage 2-5V up to stable output of 5V at 1.2A 1 x On/Off Long Rocker Switch with a rectangular shape for Single Pole Single Throw (SPST) 2 x Snap-In Contacts compatible with Single 'A'-'AA' Batteries by KEYSTONE ELECTRONICS CORP. 2 x Snap-In Contacts, identical to the previous ones from KEYSTONE ELECTRONICS CORP. 2 x High-Capacity Lithium-Ion 18650 Batteries, each offering a capacity of 2600mAh The total cost for all these parts came in under $14. Example applications for this circuit can be seen at: http://www.thingiverse.com/thing:1235865 http://www.thingiverse.com/thing:1232619 High-Voltage Lithium Battery Charging Board Details: This board comes with a built-in MICRO USB female connector, allowing direct connection to rechargeable lithium batteries using a standard phone charger. The input voltage for this board is 5V, and the charging cut-off voltage is set at 4.2V ± 1%. The maximum charge current it can handle is 1000mA, while its over-discharge protection voltage is set at 2.5V. Its overcurrent protection feature kicks in at a current of 3A. Key Specifications: Input voltage: 5V Board size: 2.6 * 1.7CM Operating instructions: First, establish contact with the battery through its B+ and B- terminals. Next, insert a USB charging cable into the board's MICRO USB female port. The LED will glow red while it charges, turning green once full capacity is reached. DC-DC Converter Module: Input voltage: 2V~5V Stable output voltage: 5V It can supply up to 1.2A of current from two AA batteries or a single lithium battery, enough power for devices such as mobile phones, cameras, microcontrollers, and digital power supplies. The module boasts an efficiency of up to 90%, averaging about 85%. Its typical application efficiency when charging at 5V/1A is around 87%. The unit comes equipped with a built-in indicator light. Electrical specifications for the DC-DC Converter: Input voltage: 2.0V ~ 5.0V Output voltage under no-load conditions: 5.1V ± 0.1V Its conversion efficiency can reach up to 90% and an average of 85%. Maximum output current (continuous operation): * With Vin ≥ 2.0V, the maximum current is 600mA. * With Vin ≥ 2.5V, the maximum current jumps to 800mA. * At Vin ≥ 3.0V, the maximum output current rises to 1000mA. * For Vin ≥ 3.5V, it reaches a high of 1200mA. The following YouTube videos offer detailed explanations: https://youtu.be/SgKGIh2LWIM https://youtu.be/J38f1Cxj9Sw Additionally, you can visit these links for more information: * http://zalophus.tistory.com/​ * https://zddh.blogspot.com/ Printer Specifications: The circuit was tested on the Pandora Dxs - DIY 3D Printer using the following settings: Printer: PANDORA DXs - DIY 3D Printer Rafts: None Supports: Yes Resolution: 0.1mm Infill: 0% Print speed (mm/s): 50 Temperatures used were: Print temperature: 200°C Bed temperature: 70°C Filament properties used for this print were: Type: PLA Diameter (mm): 1.75