This comprehensive review delves into the performance and features of the FIUNIE 12V 100Ah LiFePO4 battery. We examine its build quality, initial testing results, capacity measurements, high-amperage performance, and low-temperature protection capabilities. Through rigorous testing under various conditions, we assess the battery's reliability, safety mechanisms, and overall suitability for various applications. Our analysis includes both positive and negative observations, providing a balanced perspective on this popular LiFePO4 battery option.The review covers aspects from initial unboxing and visual inspection to extensive performance testing, including high-amperage discharge and low-temperature exposure. We explore the functionality of the integrated Bluetooth BMS and its associated app. Ultimately, we aim to provide readers with a detailed understanding of the FIUNIE 12V 100Ah LiFePO4 battery's strengths and weaknesses, aiding in their decision-making process regarding its suitability for their specific needs.
Pros And Cons
- Packaged well
- Simple design
- Includes nylon strap
- Comes with Bluetooth connectivity and app for monitoring
- Delivered at approximately 50% charge (13.1-13.2V)
- Capacity test showed 103.37 amp hours (3% over advertised capacity)
- Maintained voltage well during discharge test
- Includes overcurrent protection that shuts off the battery and automatically restarts after a short time.
- Includes low-temperature protection for charging
- No washers or lock washers on terminal bolts (potential for loosening)
- The app and voltmeter showed slightly different voltage readings
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Unboxing and Initial Impressions
The battery arrived well-packaged in a box containing the battery, user manuals (which appear identical to those for previous models), and protective Styrofoam. The battery itself is unassuming, clearly labeled with its specifications: FY, LiFePO4, 12V, 100Ah. The build quality looks solid, with a simple design and nylon strap for easy handling.
The inclusion of a Bluetooth-enabled BMS is a modern touch, offering convenient monitoring via a dedicated app. However, the lack of washers on the terminal bolts is a minor concern, potentially leading to loosened connections over time. It's a small detail but one that could impact long-term reliability.
Voltage and Charging
Upon initial testing, the battery showed a voltage of 13.18V, indicating approximately 50% charge. This is typical for LiFePO4 batteries upon delivery. A full charge should reach around 14.4V. It's recommended to fully charge the battery to 100% (around 14.2V to 14.6V) before use.
The battery's BMS claims 100A continuous discharge and charge current, with a 400A surge capacity. The lack of information on the behavior between 100A and 400A is somewhat concerning. This will be investigated during further testing.
Capacity Test Results
A capacity test revealed a total capacity of 103.37Ah, exceeding the advertised 100Ah by roughly 3%. The voltage remained relatively stable during discharge, dropping only slightly until around 35% capacity. This is positive, indicating good performance and consistent power output.
Even at the 95th percentile, the voltage remained at 12.2V, only experiencing a notable drop after this point. This behavior shows good performance for the battery.
High-Amperage Discharge Test
The high amperage test involved using various appliances to draw current from the battery. Starting with a 100A discharge for five minutes, the battery performed flawlessly. Subsequently, the test was increased to 200A, resulting in the battery shutting down after a few seconds due to overcurrent protection. This is a safety feature and is expected.
Further testing with lower amperage loads (around 165A) showed similar overcurrent protection triggering, demonstrating the battery's safety mechanisms. The battery recovered quickly after each shutdown.
Extreme Conditions Test: Low Temperature Protection
The battery was placed in a refrigerator at approximately -2.5°C (27.5°F) for 26 hours to test the low temperature protection. When attempting to charge, the charger briefly went solid red but then quickly shut off due to the battery's low temperature protection. This is essential for preventing damage to the battery.
The app confirmed the activation of the low temperature protection. The entire test demonstrated the battery’s safety features under extreme conditions, reinforcing its reliable performance.
Overall Conclusion
The FIUNIE 12V 100Ah LiFePO4 battery consistently impressed during testing. Its capacity exceeded expectations, exceeding 100Ah. The high-amperage protection features functioned flawlessly, preventing damage. Low temperature protection also worked as expected.
This battery combines good performance with robust safety features. The only minor drawback is the lack of washers on the terminal bolts. Overall, it is a reliable and high-performing option worth considering.