Lithium 18650 battery voltage indicator | 3.7V TO 4.2V
in our world. Lithium battery's are used very much in all modern electronic device's and many electronic maker use Lithium battery in their projects specially 18650 model which have nice capacity and voltage range 3.7v to 4.2v so we need a voltage indicator for it.to see How much capacity left. left. but all voltage indicators are not so cheap .we all want simple working but cheap module so I will make a simple Lithium battery voltage indicator using 1n4007 and only led
What do we need?
1.Red Led
2.Green LED
3.(1k ohm)
4.(100 ohm)
5. 1n4007 diode 4pcs
Are you looking for a simple circuit to measure your Lithium Ion single cell charging and discharging level? Here is one chip circuit, powered up from the same Lithium Ion battery you want to measure.
This circuit is designed to measure 3.7V rechargeable batteries level.
4.2V - 100%; 4V - 80%; 3.8V - 60%; 3.6V - 40%; 3.4V - 20%
LED1 - RED; LED2 - YELLOW; LED3 - YELLOW; LED4 - GREEN; LED5 - GREEN
D1 is used to protect a circuit from the battery being placed wrong way. You can use 1N4007 or something similar.
When this circuit was simulated on LTSpice, I used R1 value 18k, however, after this circuit was soldered on a printBoard, this value was to high, so I had to change it to 15k. It might be because of inaccuracy of the other resistor values.
Lithium 18650 battery voltage indicator | 3.7V TO 4.2V
in our world. Lithium battery's are used very much in all modern electronic device's and many electronic maker use Lithium battery in their projects specially 18650 model which have nice capacity and voltage range 3.7v to 4.2v so we need a voltage indicator for it.to see How much capacity left. left. but all voltage indicators are not so cheap .we all want simple working but cheap module so I will make a simple Lithium battery voltage indicator using 1n4007 and only led
What do we need?
1.Red Led
2.Green LED
3.(1k ohm)
4.(100 ohm)
5. 1n4007 diode 4pcs
Are you looking for a simple circuit to measure your Lithium Ion single cell charging and discharging level? Here is one chip circuit, powered up from the same Lithium Ion battery you want to measure.
This circuit is designed to measure 3.7V rechargeable batteries level.
4.2V - 100%; 4V - 80%; 3.8V - 60%; 3.6V - 40%; 3.4V - 20%
LED1 - RED; LED2 - YELLOW; LED3 - YELLOW; LED4 - GREEN; LED5 - GREEN
D1 is used to protect a circuit from the battery being placed wrong way. You can use 1N4007 or something similar.
When this circuit was simulated on LTSpice, I used R1 value 18k, however, after this circuit was soldered on a printBoard, this value was to high, so I had to change it to 15k. It might be because of inaccuracy of the other resistor values.
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