Key Takeaways:
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Using a LiFePO₄-compatible charger is essential for safe charging and maximum battery lifespan.
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Proper charging voltage, current, and temperature settings help prevent battery damage and performance issues.
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LiFePO₄ batteries support flexible charging and can safely operate in a partial state of charge.
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Regular inspections and balanced charging are important for batteries connected in series or parallel.
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Following recommended charging practices improves safety, reliability, and long-term battery performance.
1. Introduction
Enexer LiFePO4 batteries are designed to deliver long lifespan, enhanced safety, and reliable performance. However, like any advanced power system, they require proper care, especially when it comes to charging. Following our recommended guidelines ensures you protect your investment and maximize battery life.
2. Recommended Equipment
For the safest and most efficient charging, we recommend using only chargers that are specifically designed for LiFePO4 batteries. Here's what you should have on hand:
- Enexer LiFePO4 battery charger (or other approved LiFePO4 charger)
- Rubber gloves and eye protection
- Voltmeter (as needed)
- Wrench with rubber-insulated handles (as needed)
Important: Do not use lead-acid or non-LiFePO4 lithium chargers. Incompatible chargers can damage the battery and void your warranty.
3. Pre-Charging Inspection
Before you begin charging, conduct a visual and functional inspection:
- Look for physical damage, swelling, or corrosion on the battery.
- Check terminals for dirt, rust, or loose connections.
- Confirm the battery’s voltage and current ratings match your charger.
- Inspect charger cables and terminals for damage or contamination.
Ensuring everything is clean and functioning prevents unsafe charging conditions and poor performance.
4. Charging Guidelines
Charging Frequency
LiFePO4 batteries don’t require a full recharge after every use. It’s safe to charge them when they reach around 20% State of Charge (SOC). Leaving the battery in a Partial State of Charge (PSOC) does not harm its lifespan.
If the Battery Management System (BMS) disconnects due to low voltage, disconnect the load and recharge immediately.
Voltage & Compatibility
Chargers must operate within the correct voltage range. Under-voltage leads to undercharging; over-voltage can trigger the BMS to shut down. If you face charging interruptions, inspect the charger and consult Enexer support.
Charge Current
Charge current must not exceed the maximum current listed on your battery’s data sheet. Generally:
- Recommended Current: ≤0.2C or 20A
- Maximum Current: ≤1C or 100A
Charging Temperature
Safe temperature range for charging is 0ºC to 60ºC. For batteries with a self-heating function, charging is possible down to -20ºC, with reduced current:
- -10ºC to 0ºC: Max 10% of rated charge current
- -20ºC to -10ºC: Max 5% of rated charge current
The BMS will disconnect the battery in extreme temperature conditions. Wait for the battery to return to a safe range before charging resumes.
Charging Profiles
Enexer deep cycle LiFePO4 batteries support the following charge profiles:
1-Stage (Bulk Only)
Charges with constant current to a set voltage.
- 12V Battery Termination Voltages: 14.0V–14.6V
- 24V Battery Termination Voltages: 28.0V–29.2V
- 36V Battery Termination Voltages: 42.0V–43.8V
- 48V Battery Termination Voltages: 56.0V–58.4V
2-Stage (Bulk + Absorption)
Stage 1: Constant current to absorption voltage.
- 12V Battery Absorption Voltages: 14.0V–14.6V
- 24V Battery Absorption Voltages: 28.0V–29.2V
- 36V Battery Absorption Voltages: 42.0V–43.8V
- 48V Battery Absorption Voltages: 56.0V–58.4V
Stage 2: Voltage held until current drops to 0.05C or 5A - whichever is lower.
2-Stage + Float
Adds a float stage after absorption.
- 12V Battery Float Voltages: 13.3V–13.8V
- 24V Battery Float Voltages: 26.6V–27.6V
- 36V Battery Float Voltages: 39.9V–41.4V
- 48V Battery Float Voltages: 53.2V–55.2V
Keeps the battery topped up for standby use.
Charging in Parallel Configurations
Before connecting in parallel, ensure all batteries are within 50mV of each other. Use a voltmeter or the Enexer: Connect™ mobile app. If imbalance occurs, charge each battery individually to rebalance.
Charging in Series Configurations
Series-connected batteries must also be within 50mV of each other. A multibank charger is recommended to charge each battery individually and maintain balance.
5. Alternate Charging Sources
Enexer LiFePO4 batteries are compatible with various charging sources—but each requires specific setup parameters.
Charge Controllers & Inverter/Chargers
When using inverter/chargers or solar charge controllers:
| Voltage | Bulk / Absorption | Float | High Cut-Off | Low Cut-Off |
|---|---|---|---|---|
| 12V | 14.0–14.6V | 13.3–13.8V | 14.6V | 10.6V |
| 24V | 28.0–29.2V | 26.6–27.6V | 29.2V | 21.2V |
| 36V | 42.0–43.8V | 39.9–41.4V | 43.8V | 31.8V |
| 48V | 56.0–58.4V | 53.2–55.2V | 58.4V | 42.4V |
Enexer batteries do not require equalization or temperature-compensated charging.
Alternators & DC-DC Chargers
- Use high-quality alternators with proper voltage regulation.
- Low-quality alternators may cause the BMS to disconnect.
- DC-DC chargers are a safer and more compatible alternative.
For Full Technical Guidance
This article is a summarized version of Enexer's official deep cycle LiFePO4 battery charging recommendations. For more detailed technical specifications, safety notes, and voltage charts, we highly recommend reviewing the full Deep Cycle LiFePO4 Battery Charging Recommendations.
Click here to access the full PDF.
Ready to Power Up?
Explore our full range of Enexer LiFePO4 batteries to power your adventures, home backup, or renewable energy system. With the right charging practices, your battery will perform optimally for years to come.
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