18650 x 2 Battery Bank

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The necessary non-3D printed components are: 1 x 5V Micro USB 1A Lithium Battery Charging Board 1 x DC-DC Converter Step Up Boost Module 2-5V to 5V 1.2A 1 x Rectangle On/Off Long Rocker Switch SPST 2 x Snap-In Single 'A'-'AA' Battery Contacts 209 (KEYSTONE ELECTRONICS CORP.) 2 x Snap-In Single 'A'-'AA' Battery Contacts 228 (KEYSTONE ELECTRONICS CORP.) 2 x 18650 Lithium ion Batteries (2600mAH x 2) The Lithium Battery Charging Board is a convenient DIY option that can be directly input to a phone charger. It has the following specifications: Input voltage: 5V Charging cut-off voltage: 4.2V ± 1% Maximum charge current: 1000mA Battery over-discharge protection voltage: 2.5V Battery overcurrent protection current: 3A The first time you access the battery, it may not have a voltage between the output OUT + and OUT -, then access 5V voltage to charge your energy can activate the protection circuit. Note that the charger must be able to output 1A or more when using a mobile phone charger input. Otherwise, it may not charge. The DC-DC Converter is a high conversion efficiency module that can stable output 5V DC voltage. It has the following specifications: Input 2V~5V DC voltage arbitrarily Output current: up to 1200mA for single lithium battery power supply Typical application efficiency reached 87% The electrical specification of the DC-DC Converter is as follows: No load output voltage: 5.1V +/-0.1V Conversion efficiency up to 90%, average 85% Maximum output current: Vin>=2.0V: 600ma Vin>=2.5V: 800ma Vin>=3.0V: 1000ma Vin>=3.5V: 1200ma