I recently tested an HRB 4000mAh 6S battery pack rated at 60C to see how it performs in real-world conditions. The goal was to determine if this battery lives up to its advertised specs or if it falls short. Using controlled tests, I collected voltage, current, and temperature data to get an accurate look at the pack’s performance.
What Makes It Unique
HRB LiPo’s are known for having decent performance while having low costs and very low pack weights. Low pack weights generally take away from the performance that one would expect. In this test, we will see how well the HRB can handle the 105A load.
Internal Resistance
I measured the internal resistance of two HRB packs during the initial charge cycle. Both averaged 4.1 milliohms per cell. Using the RCexplained Patreon spreadsheet, this calculates to a real C rating of 19.5C, far below the advertised 60C. The corresponding maximum continuous current for this pack is about 78 amps, which is significantly lower than what the label suggests.
Load Test
I ran a 105-amp load test to see how the battery performs under high stress. Voltage dropped quickly, stabilizing briefly around 3.56V per cell, and the average energy per cell was 73.2 Watt-minutes. The pack delivered an average of 3394mAh, short of the advertised 4000mAh capacity. We know the useable capacity is always lower then the capacity on the battery label. The pack reached over 60°C resulting in the test being terminated. I’d like to terminate the test once the pack hits 58C but this one quickly exceeded this amount.
This confirms that the HRB pack cannot sustain the 105A continuous load safely and delivers roughly 35% of its rated C performance.
Practical Applications
Given the actual C rating and load test results, this HRB 4000mAh 60C battery is best for applications that draw under 75 amps continuously. For anyone using high-demand EDF setups or competitive RC vehicles, this battery will underperform compared to higher-quality packs. However, for casual use, inexpensive builds, or low-current setups, it can still be a usable option. Keep in mind that throttle control will deliver a lower average current draw in comparison to 100% throttle the entire time on a moderate 100A setup. THe down side is that you will not see exceptional top speeds as there is a more significant voltage drop under load.
Final Thoughts
This updated test provides a much clearer picture of the HRB 4000mAh 60C pack. It highlights the gap between advertised and real-world C rating performance, giving hobbyists the information needed to make informed choices. While it does not deliver the high C rating advertised, it can still work in specific low to mid-demand scenarios.