LiFePO4 Voltage Chart (1 Cell, 12V, 24V, 48V)

When you receive your new LiFePO4 (Lithium iron phosphate) battery, you might wonder about the battery’s voltage and state of charge (SOC). This article will show you the LiFePO4 voltage and SOC chart.

Let’s get started!

Manufacturers are required to ship the batteries at 30% state of charge. This is to limit the stored energy during transportation. It is also a good state of charge for the battery to sit at. This is because a lithium battery has a low self-discharge rate (less than 3% per month).

So when you receive a battery, it will be around 13 volts.

Now, you need the charge and discharge information of the battery. That’s why you are here. Your charger or charge controller requires more information to charge and discharge the battery properly.

Before giving you a voltage chart, you need to know that the discharge rate affects the voltage. If we discharge a battery at 1C, the voltage will be lower than at 0.2C. That’s why you should measure the voltage in an open circuit or with no loads attached.

This is the complete voltage chart for LiFePO4 batteries, from the individual cell to 12V, 24V, and 48V.

chart that shows voltages for one cell, 12 Volt, 24 Volt and 48Volt batteries. The percentage state of charge shows the volts.

Download the LiFePO4 voltage chart here (right-click -> save image as).

Where to measure the SOC of the battery?

Always measure the state of charge at the battery terminals. This is because the voltage drop to other components like a charge controller or inverter can be high with such minimal fluctuations in voltage.

If the terminals of the inverter measure 13V but your battery terminals measure 13.2V, that’s a difference of 60% capacity!

What are the bulk, float, and equalize voltages of LiFePO4?

Some charge controllers do not have a dedicated Lithium setting. Therefore you can adjust the lead-acid parameters to match the lithium characteristics. It’s important to know that lithium only has bulk charging. It charges as much as possible, and when the battery is full, it stops.

The Bulk charge will be set at 100% SOC. The battery will be charged until this voltage is reached.

The float function for lead-acid batteries is there to keep the batteries topped up at a certain voltage because lithium has a very low self-discharge rate we can set it at 50% capacity. Because that’s the point where lithium is happy. You can also set it at 80-90% SOC. If you can disable it, do that.

The equalize function is also something for lead acid. If you can disable it do that, but if you cannot then use the recommended voltages in the table below.

1 Cell 12V 24V 48V
Bulk 3.65 14.6 29.2 58.4
Float 3.25 13.0 26.0 42.0
Equalize 3.65 14.6 29.2 58.4

Increase the lifespan of your LifePO4 battery

Cycle life

Lithium batteries are known for their long cycle life of up to 6,000 cycles. After those 6,000 cycles, there will still be 80% of the capacity left. To put that into perspective, that’s 16 years of daily cycling of the battery.

Now, those 6,000 cycles are reached when you don’t discharge below 10% and charge over 90%. That means a 100Ah battery has a usable capacity of 80Ah to reach 6,000 cycles. If you use the whole capacity of the battery, then you can get 4,000 cycles, which still is a lot.


You need to keep the temperature of the battery cool too. Going over 40°C or 104°F will make your battery age faster, thus decreasing its cycle life.

lifepo4 cycle number with different temperatures
The cycle curve between 25 and 50°C (77 and 122°F). The higher the temperature, the lower the lifespan.


The same goes for the charging and discharging rate of the battery. As you might already know, the C-rate is used for a battery’s discharge and charging speed. A 100Ah at 1C discharge is getting a load of 100Amps. The battery can handle this, but it’s not ideal.

Try to have a charging and discharging rate of 0.2C for your battery. This is a 20amp charge or discharge current for a 100Ah battery. One way to increase your charging and discharging rate is to increase your battery’s Ah (capacity). Buy a 280Ah cell, and you can charge and discharge at 56Amps for maximum cycle life.

cycle voltage at different c rates
The discharge curve at different C-rates. The higher the discharge current, the lower the voltage.


You might have heard about compressing the cells for increased lifespan if you build your batteries yourself. This is done at 300kgf (kilogram-force) or 3000 newtons. This doesn’t necessarily mean that you need to compress them. Using nylon tape around the cells is a great option. The idea here is to make it almost impossible for the cells to expand to limit gas formation.


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6 thoughts on “LiFePO4 Voltage Chart (1 Cell, 12V, 24V, 48V)”

  1. I got a 100ah LiFePo4, put a LiFePo4 charger putting out 1.5 amps, meter shows 13.6 max while charging, but when it said FULL I disconnected charger clamp and volt meter display showed 12.8VDC but jumped all over the place, up to 13.2VDC so is this brand new battery screwy?

    • It will take a long time to charge a battery with a 1.5A charger. Are you sure you put the right parameters in the charger? Did the charger stop charging when it reached 13.6V?

  2. I have a KS Energy 205 AHr 12V LiFePO4 battery. It has bluetooth monitoring and according to the app it is at 90% SOC but the voltage is only 11.87V with no load. The individual cells are 2968, 2970, 2970 and 2970 mV. Temperature 8 deg C. Any idea why the voltage is so low?

    • Your battery looks to be empty. Is it possible to charge it without the BMS shutting it down at 100%. If that’s not possible you need to look into recalibrating the SOC. Normally, this can be done through the app of the BMS. It could also be in storage mode, refer to the manual how to take it out of storage mode.


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