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li-ion Battery Indicator

This is a 12v battery voltage indicator circuit. This circuit will work if the voltage goes about 14 v and below 10 v ( you can adjust the voltage.
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li-ion Battery Indicator

Introduction li-ion Battery Indicator:

SOC is defined as the status of available energy in the battery and is usually expressed as percentages. Because the available and energy change depends on different charging/discharging and currents, as temperatures, and aging effects, the SOC could be defined more and clearly as ASOC (Absolute state of charge) and RSOC (Relative state of charge). Typically, as the range of RSOC is from 0% to 100%, a fully charged battery’s RSOC is always 100% and a fully discharged battery has 0% RSOC. The ASOC is a reference and is calculated by Design Capacity which is a fixed capacity From when the battery is manufactured. A fully charged new battery will have 100% ASOC, but a fully charged and aging battery could Be less than 100% because of different charge/discharge conditions.

The following and diagram is an example of Voltage vs. Capacity at different C-rates. The higher C-rate loading will have a lower output capacity. Lower temperatures result in lower output capacity.


  1. Power supply voltage:DC4.5-6V
  2. Discharge voltage:1.00V-15.00V 0.01V
  3. Termination voltage range:0.5-11.0V
  4. Supported by current:3.000A 0.001A
  5. Maximum voltage measurement error:1% + 0.02V
  6. Maximum current measurement error:1.5% + – 0.008A
li-ion Battery Indicator

Circuit Operation:

The LM3916 is a monolithic integrated circuit used as a dot/bar display of a divider. It specializes in sensing and various levels of Analog voltages to operate ten LEDs. The current flowing through these LEDs is so programmable and regulated that it bypasses the use of a current-limiting resistor in series with LEDs.

This voltage ranges from a low value of 3V to as high as 25V. The voltage and reference used in IC are easily adjustable. the input signal from 0-1.5V of positive DC is made acceptable by the use of a high-impedance and input buffer. In this project, we are making a Battery Monitor and circuit. When we do projects related to batteries or power supply, we always have a dare. We know that the battery did not load and offload. There is a method for battery checking, which is possible with a voltmeter. Still, the battery and controller were built to test battery charging. By linking batteries to the circuit, we can quickly check batteries. Some battery status LEDs are used to display.

li ion battery indicator circuit operation.

This is a 12v battery voltage indicator circuit. This circuit will work if the voltage goes about 14 v and below 10 v ( you can adjust the voltage of indication using Preset ). The 12v circuit contains a single and comparator ic which will detect the high voltage and low voltage. The is used in this circuit and diagram is LM339.

The transistor is connected to the LED. If the battery voltage goes up while charging and crosses the set values that time the LED gets glow. That point of LED glowing can be set using a multimeter manually. Suppose the battery voltage goes down that times the second LED will glow and indicate a lower voltage in the battery.

Figure 1 shows an ultralow power, as a precision undervoltage-lockout circuit. The circuit monitors the voltage of a Li-Ion battery and disconnects the load to protect the battery from deep discharge when the battery and voltage drop below the lockout and threshold. Storing a battery-powered form product in a discharged state puts the battery and risk of being completely form discharged. In a discharged condition, current to the protection and circuitry continuously discharges the battery. If the battery and discharged below the recommended end-of-discharge voltage, overall battery performance degrades, the cycle life is shortened and the battery may die prematurely. In contrast, if the lockout voltage is set too high, maximum battery capacity is not realized.

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How the li-ion Battery Indicator Work:

I'm not sure the exact voltage at which Lithium Ion can't be recharged without risk, but I have integrated circuit based battery protectors for 18650 cells which cut off at 2.5V. Anything below that and the circuit cuts out, but the battery can still be recharged. Doubtless this may be a bit tough on the battery, though I also have commercially made AA sized Lithium Ion flashlight batteries with a protection circuit that cuts off at the same 2.5 volt low end voltage, so probably safe enough.

So you have at least a 0.5 volt range, more likely higher, of discharge, perhaps higher depending on at what point the manufacturer of the device decides the battery is discharged. This voltage is compared to a discharge curve for the battery and the resulting charge percentage is calculated and displayed. Not perfectly accurate, but close enough for practical use.

If your cellphone displays battery voltage you can run the battery down and see what the low end cutoff voltage assigned to your device/battery by the manufacturer actually is, or thereabouts. There are also other charge indicating apps like Ampere that can display battery voltage.

Frequently Asked Questions

What affects Li ion battery life?

The size of charge and discharge current, the choice of charge and discharge cut-off voltage, and which charge and discharge method to use, etc. charge and discharge systems also have a very important impact on the cycle life of lithium-ion batteries.

What causes Li ion battery to swell?

Lithium-ion batteries can swell for various reasons such as age, number of charge cycles, or exposure to high heat. For more information on how to improve the performance and lifespan of the laptop battery and to minimize the possibility of occurrence of the issue, see Dell Laptop Battery - Frequently Asked Questions.

What causes lithium-ion battery failure?

Voltage depression is one of the most common causes of lithium-ion battery failure. Voltage depression occurs when the voltage of a battery drops below the threshold of 2.8V per cell, or 3.6V for a single-cell battery.

What causes damage to lithium battery?

Broken or cracked cases can allow moisture and oxygen to enter the battery and oxidize the lithium components, causing a heat reaction. This can lead to fires or explosions. Overheating, overcharging and shock from dropping or crushing can also cause heat reactions to occur.

How to fix a swollen battery?

There is no proper method to repair a swollen battery. An expert has to take out all gases which are there inside your battery. This has to be done very carefully. Chances of busting battery are there while working on this battery.

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