The boost converter LM2587 Out+ terminal is connected to the positive terminal of the output DC Jack through a Schottky diode ( 1N5822 ) and the Out- terminal is connected directly to the negative terminal of the DC jack. The battery positive terminal is connected to the boost converter LM2587 IN+ terminal through a rocker switch and the negative terminal is directly connected to the boost converter IN- terminal. The output terminal of the TP5100 charging module is connected to the battery pack. The 12V input power from the DC adapter is connected to the input terminal of the TP5100 module through a 5.5mm DC Jack. The positive terminal input DC jack is connected to the positive terminal of the output DC jack through a Schottky diode ( 1N5822 ). In the schematic diagram, the two18650 batteries are connected in series and then they are connected to a 2S BMS board for protection during the charging and discharging. The two diodes 1N5822 are used to block the reverse current flow. The voltmeter display is used to display the battery voltage level. When the mains power fails, the stored energy in the battery is used to power up the router. The working of the circuit is very simple, in normal condition, power from the mains is drawn by a 12V DC adapter to charge the 2x 18650 batteries and to provide power to the router.
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