In this test, I looked at the Fyrrework 5300mAh 120C LiPo battery, the first hard case RC car pack I haev tested. The hard case requires me to open it up to access the cells directly. This allows me to measure internal temperature safely during high-load testing.
Fyrrework sent these packs for review, making this the first time a manufacturer has provided hard case batteries for RC car testing on the channel. I compared the results directly against the Turnigy Rapid 100C 5000mAh pack, which I tested previously.
What Makes It Unique
The Fyrrework 5300mAh 120C battery stands out in a few ways.
First, it’s the only hard case pack tested so far. That’s significant for RC car users, since these packs are built for protection against impact and debris.
Second, Fyrrework includes a plastic cover over the balance lead, making it easier to grip and connect safely. It’s a small feature, but one that adds real usability when handling and charging.
Finally, Fyrrework was the first company to send packs for testing, showing confidence in how their batteries perform under transparent data-driven review conditions.
Internal Resistance (IR)
The internal resistance test was done at an 8A charge rate (1.5× the pack’s rated capacity). The first pack showed slightly high IR values, but the second pack was lower. When averaged, the IR came out to 5.93 mΩ. Using my LiPo calculator, that translates to a calculated C rating of about 14C and a maximum continuous current of around 75A. For comparison, the Turnigy Rapid 5000mAh pack showed 6.58 mΩ and calculated to 13.8C with a continuous current of about 69A.
That means the Fyrrework pack had a measurable edge in internal resistance performance, delivering slightly higher usable current under load.
Load Test
Next, I ran a 105A discharge test to measure real-world performance. Both the Fyrrework and Turnigy Rapid were tested under identical conditions.
The results:
- Fyrrework delivered ~600mAh more capacity under load than the Turnigy Rapid.
- At 3.50V, the Fyrrework output 362mAh, compared to only 66mAh from the Rapid.
- At the 10-second mark, Fyrrework’s voltage stayed at 3.54V, while Turnigy Rapid dropped to 3.39V.
- Energy delivered: 563Wh for Fyrrework vs 443Wh for Turnigy Rapid.
- Average cell wattage: ~330W per cell (Fyrrework) vs ~315W per cell (Turnigy Rapid).
Across all metrics, the Fyrrework 5300mAh 120C showed stronger voltage retention, higher energy output, and better consistency.
Practical Applications
For RC car enthusiasts, the Fyrrework 5300mAh 120C battery offers real advantages:
- Stronger performance under load than the Turnigy Rapid 100C.
- Hard case protection ideal for off-road bashing or competitive racing.
- Usable design touches like the balance lead protector, which make charging easier.
These results suggest Fyrrework’s claimed specifications align more closely with its real-world performance than many competing brands.
Final Thoughts
The Fyrrework 5300mAh 120C LiPo battery proved to be a solid performer in both IR and load tests. It maintained voltage better, delivered more power, and offered thoughtful design details that made it easy to use. Compared to the Turnigy Rapid 100C, the Fyrrework pack consistently showed higher capacity under load and stronger voltage stability — clear indicators of quality cell construction.
If you’d like full access to the raw data and comparison sheets from my battery tests, consider joining my Patreon community. Tier 1 members get access to the same RC LiPo calculator used in these reviews.