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That does however conflict with the Arduino's warning about power the board via it's 5V pin: 5V.This pin outputs a regulated 5V from the regulator on the board. The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V).
With a 12V battery, you will find that you are only drawing about 1A from the battery when you are supplying 5V @ 2A to the load! And with a 12V battery, the battery could discharge "badly" to about 7V, and the thing would still work. (This would make your battery work more-like a gas tank.)
You apply the +5V to the +5V pin on the board, bypassing the linear regulator. You don't feed it in thru the power coaxial connector of the board. I believe you will still be powering the onboard 3.3V linear regulator though.
ES-5.12KWH User Manual Safety Precautions Warning Please do not put the battery into water or fire, in case of explosion or any other situation that might endanger your life. Please connect wires properly while installation, do not reverse connect.
Also make sure you use a good battery like an original samsung, panasonic or lg 18650 cell instead of ultrafire crap like DrAzzy said. Using 2 cells in series and using a buck like INTP suggested is the better choice in my opinion, however a single 18650 cell can be boosted to meet your project demand without any problems.
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Find the detailed tutorial to design this 5V 2A SMPS power supply circuit: https://circuitdigest /electronic-circuits/5v-2a-smps-power-supply-circuit-diag...
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