![]() (That all we need for charging the battery). Then the BAT+ and BAT- of the board is connected to the +ve and -ve ends of the battery. A diode is inserted at the positive end for the reverse voltage protection. The solar cell is connected to the TP4056 battery charging board's IN+ and IN- respectively. Both boards offer 1A charging current and then cut off when finished.įurthermore, the one with protection switches the load off when the battery voltage drops below 2.4V to protect the cell from running at too low (such as on a cloudy day) - and also protects against over-voltage and reverse polarity connection (it will usually destroy itself instead of the battery) however please check you have it connected correctly the first time. One with battery discharge protection module and one without it. There are two versions of this board available in the market. ![]() The battery will be connected to these two point marked as BAT+ and BAT- (pretty mush self explanatory) The board requires an input voltage of 4.5 to 5.5v to charge the battery ![]() These points are marked as IN- and IN+ We will be utilizing these two point to power this board. There are also these two points where you can solder your own charging unit. Then there is this mini USB connector to charge the battery from an external USB charger. The red one comes on when it is charging and the blue one comes on when the charging is done. There are two LEDs on board one red and one blue. Looking at this board we can see that it has the TP4056 chip along with few other components of our interest.
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