The Ultimate Guide to LiFePO₄ Battery Voltage Charts (2025 Edition)
Introduction
LiFePO₄ (Lithium Iron Phosphate) batteries are becoming the gold standard for RVs, marine vessels, and off-grid homes across Europe. Compared to lead-acid batteries, they are safer, lighter, and last 5× longer.
But here’s the catch: to get the most out of your LiFePO₄ battery, you need to understand its voltage behavior. Unlike lead-acid, LiFePO₄ has a flat voltage curve, which means traditional “voltage guessing” doesn’t work the same way.
That’s why we’ve created this comprehensive voltage chart — so you can:
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Quickly check your battery’s State of Charge (SOC)
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Know the right charging & float voltages
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Prevent over-discharge and extend lifespan
Section 1: Understanding LiFePO₄ Voltage Basics
Before diving into charts, let’s clarify a few key terms:
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Nominal Voltage: The standard operating voltage (≈3.2V per cell → 12.8V for a 12V pack).
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State of Charge (SOC): How full the battery is, expressed as a %.
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Cut-off Voltage: The minimum safe voltage before damage may occur.
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Float Voltage: The voltage at which the battery is maintained once fully charged.
👉 Compared to traditional lead-acid (3.6–3.7V per cell), LiFePO₄ has a lower nominal voltage but a flatter discharge curve, which makes it more predictable and stable
📌 The following diagram and video will introduce the activation process for the battery after you receive it.
Section 2: LiFePO₄ Voltage Chart (12V / 24V / 48V Systems)
| SOC (State of Charge) | 12V LiFePO₄ | 24V LiFePO₄ | 48V LiFePO₄ |
| 100% | ≥ 13.3V | ≥ 26.6V | ≥ 53.2V |
| 75% | 13.2–13.3V | 26.4–26.6V | 52.8–53.2V |
| 50% | 13.1–13.2V | 26.2–26.4V | 52.4–52.8V |
| 25% | 13.0–13.1V | 26.0–26.2V | 52.0–52.4V |
| 0% | 10–12V | 20–24V | 40–48V |
📌 Note: Values vary slightly depending on load and temperature. Always allow the battery to rest (no charging/discharging) for accurate measurement.
Section 3: Charging & Discharging Guidelines
| Parameter | 12V LiFePO₄ | 24V LiFePO₄ | 48V LiFePO₄ |
| Charging Voltage | 14.2–14.6V | 28.4–29.2V | 56.8–58.4V |
| Float Voltage | 13.5–13.6V | 27.0–27.2V | 54.0–54.4V |
| Equalize Voltage | 14.4–14.6V | 28.8–29.2V | 57.6–58.4V |
| Low Voltage Cut-off | ≈10V | ≈20V | ≈40V |
| Nominal Voltage | 12.8V | 25.6V | 51.2V |
⚠️ Best Practice:
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Never charge below 0°C (unless using a heated model).
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Avoid discharging below cut-off (damage risk).
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Use a LiFePO₄-compatible charger for optimal results.
📌 The following diagram and video will illustrate the battery charging process.
Section 4: How Voltage Affects Performance
Voltage directly impacts how your battery performs:
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Capacity & Runtime – Lower voltage = reduced usable energy.
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Power Output – Stable voltage = consistent power for appliances.
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Safety – Built-in BMS prevents over-voltage and under-voltage.
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Longevity – Proper charging keeps cycle life at 4,000–6,000+ cycles.
📌The following diagram and video will demonstrate the battery voltage when fully charged and completely discharged.
Fully charged
Completely discharged
Section 5: How to Measure Your Battery Voltage
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Turn off all loads & chargers.
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Use a digital voltmeter (set to DC range).
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Connect red lead → positive terminal, black lead → negative.
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Read voltage after resting 10–15 minutes.
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Compare with the SOC table to estimate charge level.
📌 Pro Tip: Use the Sentorise Bluetooth App to monitor SOC, voltage, cycles, and temperature in real time — no tools required.
Section 6: FAQs
Q1: What is the safe low voltage cut-off for a 12V LiFePO₄? ≈10V. Going below this risks permanent damage.
Q2: Can I charge LiFePO₄ with a lead-acid charger? Only if it has a lithium profile (14.2–14.6V). Otherwise, use a lithium-compatible charger.
Q3: Do LiFePO₄ batteries need equalization like lead-acid? No. Sentorise batteries include a BMS for automatic balancing.
Q4: What happens if my LiFePO₄ gets too cold? Below 0°C, charging is blocked. Heated models auto-warm to allow safe charging.
Q5: How do I know if my battery is fully charged? Voltage should stabilize at 14.4–14.6V (12V model). The Bluetooth App will show 100% SOC.
Section 7: Conversion & Trust
Product Highlight: Sentorise 12V 100Ah Core LiFePO₄
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100% usable capacity
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Lightweight (12kg)
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Bluetooth monitoring
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Low-temp protection
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5-year warranty
Section 8: Recommended Reads
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[How to Choose the Right RV Battery Capacity]
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[Winter RV Trips: How to Keep Your Batteries Running in the Cold]
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[Off-grid Living: The Ultimate Guide to Home Solar & Battery Storage]
Conclusion
Understanding LiFePO₄ voltage behavior is the key to maximizing performance, safety, and lifespan. With the right chart and proper charging practices, your Sentorise battery will deliver reliable power for years to come.
✅ EU-certified (CE, RoHS, UN38.3)
✅ Designed for European RV, marine, and off-grid users
✅ Backed by 5-year warranty
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