LiFePO4 Voltage Chart

Compare LiFePO4 voltage references for a cell, 12V, 24V or 48V bank. Explore a manufacturer discharge chart and see why loaded, resting and charging voltages differ.

Battery voltage class

How voltage changes as a cell discharges

ANR26650M1B · LiFePO4 (Nanophosphate) · 25 °C ambient, open air. We read these approximate points from the manufacturer’s 1C and 4C discharge curves. 4S values add the voltages of identical cells at the same discharge state. These pack views are calculated from the single-cell curve, rather than measured on a pack.

Choose a point on the discharge curve

At 1.25 Ah discharged: approximately 12.92 V at 1C and 12.44 V at 4C.

Approximate loaded voltage · 12V class · 4S
Discharged per cell	1C voltage	4C voltage
0.25 Ah	13.12 V	12.72 V
0.5 Ah	13.08 V	12.64 V
0.75 Ah	13.00 V	12.60 V
1 Ah	12.96 V	12.52 V
1.25 Ah	12.92 V	12.44 V
1.5 Ah	12.88 V	12.36 V
1.75 Ah	12.80 V	12.20 V
2 Ah	12.68 V	12.04 V
2.25 Ah	12.48 V	11.68 V

We read selected points from the published graph and rounded them to 0.01 V. Our approximate reading uncertainty is ±0.03 V per cell; this is not a manufacturer tolerance. The straight lines help you follow the curve between points. We left out points near cutoff because the steep graph makes them difficult to read reliably. This cell is rated at 3.3 V nominal with a typical capacity of 2.6 Ah. Other LiFePO4 products use 3.2 V nominal. Use your own battery specifications to set charging and cutoff voltages.

12V, 24V and 48V LiFePO4 reference voltages

Four, eight and sixteen cells in series commonly give nominal ratings of 12.8, 25.6 and 51.2 V when the cells are rated at 3.2 V. Series connection adds voltage; parallel connection adds capacity. Check the chemistry and cell count on the battery label or datasheet, since several battery types use a 48V label.

The table below uses Victron Lithium Smart specifications. These are charger settings and reference ratings for a different product from the Lithium Werks cell plotted above.

Victron Lithium Smart settings, scaled to 4S
Reference	Voltage	What it means
Nominal rating	12.80 V	The rated voltage used to calculate energy. It does not indicate a charge percentage.
End of discharge	11.20 V	The discharge endpoint specified for Victron Lithium Smart batteries. Check your own battery manual for its cutoff.
Float setting	13.50 V	The voltage a charger holds during float for this product family. A fully charged battery at rest can read differently.
Recommended charge setting	14.20 V	14.2 V / 28.4 V in the manufacturer table. Follow your own battery manual.
Charge range, lower	14.00 V	The lowest charge voltage in the Victron Lithium Smart specification.
Charge range, upper	14.40 V	The highest charge voltage in that range. Check all specifications when matching a charger.

Victron specifies nominal capacity at 25 °C and a discharge current of 1C or less. Its operating temperature ranges are +5 to +50 °C for charging and −20 to +50 °C for discharging. The voltage settings apply while a charger is connected, rather than at open circuit. We calculate the single-cell and 16S values from the published 4S/8S specifications; they are not separate test results.

Can voltage tell me the battery’s state of charge?

Voltage alone cannot give an exact percentage. The discharge plot shows a long, nearly flat region, and the same cell’s voltage changes with current. Temperature, ageing, imbalance and recent charging also affect the reading. Use a calibrated battery monitor or BMS that tracks charge flow when you need a remaining-capacity estimate.

Resting, loaded and charging readings

A resting reading is taken with charging and loads disconnected after the battery has relaxed according to its manufacturer’s measurement procedure. The source data here was recorded under load, so we cannot use it to match resting voltages to charge percentages. Under load, voltage falls; during charging, the charger raises terminal voltage. A float setting is not a resting full-charge measurement.

Sources and method

Lithium Werks 26650 Data Sheet, August 2022, SF00008 rev 2, page 2 contains the discharge curves and cell ratings used here. The manufacturer recorded the 1C and 4C discharge curves under load at 25 °C ambient in open air. These are not resting or open-circuit readings, so a rest duration does not apply and is not specified. The plotted points are our readings of the graph, rather than raw test data. Multiplying voltage by the series count also multiplies the reading uncertainty. The pack views assume identical cells in series and do not account for parallel capacity or cell imbalance.

Reference reviewed 2026-09-06. The chart and table downloads include the source and test conditions.