1. Introduction
This manual provides essential information for the safe and efficient use of your ERYY 12V 25AH LiFePO4 Lithium Battery, Model YD1225. This battery is designed for deep cycle applications, offering a lightweight, long-lasting, and maintenance-free power solution. Please read this manual thoroughly before installation and operation.
2. Important Safety Information
WARNINGS:
- DO NOT store at a temperature above 60°C (140°F).
- DO NOT short circuit, disassemble, crush, reverse polarity, expose to fire, or incinerate.
- Avoid using lead-acid chargers. Only use LiFePO4 compatible chargers.
- DO NOT employ this as a starter battery for any kind of vehicle, such as automobiles, RVs, motorcycles, or tractors. This battery is for deep cycle applications only.
3. Product Overview and Features
The ERYY 12V 25AH LiFePO4 battery is a high-performance, rechargeable lithium iron phosphate battery featuring advanced technology for reliability and longevity.
- Capacity: 25AH (actual capacity up to 30Ah), 384Wh electric energy.
- Long Lifespan: Offers 5,000+ deep cycles, providing a 10+ year lifespan.
- Integrated BMS: Built-in 30A Battery Management System protects against overcharge, over-discharge, short circuits, overheating, and balances cells for maximum efficiency.
- Lightweight & Compact: Weighs approximately 6.3 lbs and measures 7.1"D x 2.8"W x 6.8"H.
- Wide Operating Temperature: Operates from -20°C to 60°C (-4°F to 140°F).
- High Efficiency: 98% charging and discharging efficiency with zero maintenance.
- LCD Voltmeter: Integrated display for real-time battery status.
Figure 1: ERYY 12V 25AH LiFePO4 Battery with LCD Voltmeter.
Figure 2: Physical dimensions and M5 terminal details of the ERYY 12V 25AH LiFePO4 Battery.
Figure 3: Illustration of Grade A cells and the multi-protection features of the 30A BMS.
4. Setup
4.1. What's in the Box
- 1 x ERYY 12V 25AH LiFePO4 Battery
- M5 Screws for terminal connection
4.2. Connecting Batteries in Series and Parallel
The ERYY 12V 25AH battery supports series and parallel connections for increased voltage or capacity, up to a maximum of 4P4S (48V/24Ah). For safe expansion, ensure all batteries used in series or parallel connections have the same capacity (25Ah), voltage (12V), BMS (30A), and are of the same brand (ERYY).
Pro Tip: Before connecting in series or parallel, fully charge each battery to approximately 13.4V (resting voltage).
Figure 4: Examples of series and parallel connections for ERYY LiFePO4 batteries.
Video 1: Instructions on how to connect ERYY batteries to build a battery bank, supporting up to 4P4S configurations.
5. Operating Instructions
5.1. Charging Options
Your ERYY LiFePO4 battery offers three primary charging methods:
- LiFePO4 Charger: Use a dedicated LiFePO4 charger with a charging current of ≤10A. This typically fully charges the battery in 2-4 hours. Ensure the charging temperature is between 0°C-45°C (32°F-113°F) and the voltage is 14.2V±0.2V for optimal safety.
- Solar Panel + MPPT Controller: For off-grid applications, pair your battery with a solar panel and an MPPT controller that is compatible with LiFePO4 batteries.
- Generator + LiFePO4 Charger: A generator can be used in conjunction with a LiFePO4 charger. The maximum charging/discharge current should not exceed 30A.
Important: Never use lead-acid chargers with your LiFePO4 battery.
Figure 5: Overview of the three recommended charging methods for your ERYY LiFePO4 battery.
5.2. LCD Voltmeter Usage
The built-in LCD voltmeter provides real-time status of your battery's charge level:
- Recharge Indication: Recharge the battery when only 2 bars remain on the display, indicating approximately 20%-30% capacity.
- Preventing Drain: Unplug the battery from devices when not in use to prevent unnecessary power drain.
Video 2: Detailed overview of the ERYY 12V 25Ah LiFePO4 Battery, highlighting its 384Wh capacity, 30A BMS, and LCD Voltmeter features.
Video 3: Demonstrates the ease of use and various applications of the ERYY 12V 25AH LiFePO4 Battery.
5.3. Typical Applications
This versatile battery is suitable for a wide range of deep cycle applications, including but not limited to:
- RVs and Marine electronic equipment
- Trolling motors and Fish finders
- Camping gear and Outdoor power needs
- Solar and Wind energy storage systems
- Power wheelchairs and Electric scooters
- UPS backup and Security equipment systems
- Home photovoltaic energy storage, children's electric vehicles, water pumps, and car refrigerators.
Figure 6: Visual examples of common applications for the ERYY LiFePO4 battery.
Figure 7: More examples of applications, including solar/off-grid systems and marine power.
6. Maintenance
6.1. Storage Guidelines
To ensure the longevity and optimal performance of your battery during storage:
- Maintain a charge level of 3-4 bars (40%-60% capacity).
- Perform a float charge for 1 hour monthly.
7. Troubleshooting
If you encounter issues with your ERYY LiFePO4 battery, consider the following common troubleshooting steps:
- No Power/Low Voltage: Ensure the battery is adequately charged. Check all connections for tightness and corrosion. Verify that the charging method is appropriate for LiFePO4 batteries.
- Charging Issues: Confirm you are using a dedicated LiFePO4 charger. Check the charger's output voltage and current. Ensure charging is within the recommended temperature range (0°C-45°C).
- Overload Protection: If the battery suddenly stops providing power, the BMS may have activated due to an overload or short circuit. Disconnect the load, wait a few minutes, and then reconnect. Reduce the load if the issue persists.
- Temperature Extremes: Avoid operating or charging the battery outside its specified temperature ranges (-20°C to 60°C for discharge, 0°C to 45°C for charge). Extreme temperatures can trigger BMS protection.
- Series/Parallel Connection Problems: If using multiple batteries, ensure they are identical in capacity, voltage, BMS, and brand. Confirm all batteries were fully charged to ~13.4V before connection. Check all wiring for correct polarity and secure connections.
If these steps do not resolve the issue, please contact ERYY customer support for further assistance.
8. Specifications
| Feature | Specification |
|---|---|
| Brand | ERYY |
| Model | YD1225 |
| Battery Type | Lithium Iron Phosphate (LiFePO4) |
| Rated Voltage | 12.8V |
| Rated Capacity | 25AH (Actual capacity 30Ah) |
| Electric Energy | 384Wh |
| Battery Cell | Grade A Cells |
| Cycle Life | 5000+ cycles (approx. 10 years) |
| BMS | Built-in 30A BMS |
| Maximum Load Power | ≤300W |
| Max. Discharging Peak Current | 90A |
| Maximum Charging/Discharge Current | ≤30A |
| Charging Voltage | 14.4V±0.2V |
| Charging Method | CC/CV |
| Charging Temperature | 0°C-45°C (32°F-113°F) |
| Discharging Temperature | -20°C-55°C (-4°F-131°F) |
| Charging Low Temp Recovery | 5°C |
| Product Dimensions (D x W x H) | 7.1" x 2.8" x 6.8" |
| Item Weight | 6.3 lbs (7 pounds listed in specs, using 6.3 from feature bullet for consistency) |
| Terminal Type | M5 |
| Max Series/Parallel Connection | 4P4S |
9. Warranty and Support
The ERYY LiFePO4 battery is designed for a long lifespan of over 10 years (5,000+ cycles). For any questions or assistance, 24/7 customer support is available to ensure peace of mind.