Quantity   Component name
2 × Endcaps laser-cut 3mm thick fiberboard endcaps
1 × Microchip MCP73831T-2ACI/OT U1, Lithium battery charge controller
2 × 4.7uF 16V 0805 capacitor C1, C2
1 × 4.7K 0805 resistor R1
1 × 470 ohm 0805 resistor R2
1 × Molex 1051330011 J1, vertical micro B USB receptacle
1 × JSR S2B-PH-K-S(LF)(SN) J2, horizontal JST PH 2mm receptacle
1 × Red LED 0805 D1, charge indicator LED (re-scale R2 if you change LED color)
1 × 803040 size 3.7V LiPo battery with JST connector
1 × MAX40203AUK U2, Ideal Diode
1 × MMBZ5231 Z1, 5.1V zener