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2S 7.4V Lipo Battery

High-Discharge 2S 7.4V LiPo Solutions: Precision Power for RC & FPV
Whether you are powering an Arrma Typhon Grom or a high-speed micro FPV drone, the 2S Lipo battery is the industry standard for balancing weight and torque. Unlike standard AA cells that sag under load, a premium 2 cell Lipo battery provides a flat discharge curve, ensuring your motors maintain peak RPM until the end of the flight or race. If you’ve been running a Gens Ace 2S Lipo or a Spektrum Smart pack, you know that quality internal resistance (IR) is what separates a podium finish from a thermal shutdown.

Technical Specifications & Compatibility

Feature
Micro/Small (e.g., 1400mAh)
Standard/Basher (e.g., 5000mAh)

Nominal Voltage
7.4V (2S)
7.4V (2S)

Max Charge Voltage
8.4V (4.2V per cell)
8.4V (4.2V per cell)

Common Applications
Arrma Grom, Micro Quads, Airsoft
1/10 Scale RC Cars, Large FPV Wings

Typical Discharge Rate
30C – 60C
50C – 120C

Engineering Analysis: The 2S Architecture
In my decade of engineering power systems, the “2S” designation is often misunderstood. It stands for 2 Series, meaning two 3.7V nominal cells are wired in series to hit 7.4V. While some users consider jumping to 3S for more speed, a 2S setup is often superior for longevity and motor thermals. As seen in recent community discussions, many pilots struggle with “puffy” batteries; this is usually a result of over-discharging below 3.0V per cell or using inadequate charging hardware. To prevent this, always utilize high-quality Balance Chargers like the IMAX B6 to ensure cell parity.

For those running heavy bashers, remember that resistance equals heat. Using high-quality Battery Straps ensures your pack doesn’t eject during a crash, which can lead to internal cell damage or short circuits. Safety is paramount: always store your packs in Fireproof Bags when not in use, especially if you notice any slight swelling or “puffing” after a hard run.

Frequently Asked Questions (FAQ)

How long does a 7.4V LiPo battery last?
A typical 2S LiPo battery has a lifespan of 2-3 years (approximately 300-500 charge cycles) if maintained at storage voltage (3.85V per cell). In terms of runtime per session, a 1000mAh battery typically provides roughly 2,000 shots in Airsoft or 10-15 minutes of flight time in micro drones, depending on throttle management.

What does 2S mean on a LiPo battery?
The “2S” indicates that the battery consists of two individual cells connected in series. This adds the voltage of each 3.7V cell together to reach a nominal 7.4V, while the capacity (mAh) remains the same as a single cell.

What is better, 2S or 3S?
It depends on your motor’s KV rating. A 3S battery provides more top-end speed and efficiency because higher voltage allows for lower amperage to achieve the same power. However, 2S is better for indoor racing and micro-platforms where weight and heat dissipation are critical constraints.

Can I use a 12V charger for a 7.4V battery?
No. You should never use a generic 12V power supply or charger. LiPo batteries require a dedicated CC/CV (Constant Current/Constant Voltage) charger specifically designed for lithium chemistry to prevent overcharging and potential fire hazards.

Can I leave my LiPo fully charged overnight?
It is not recommended. Leaving a LiPo at 100% charge (4.2V per cell) for more than 24 hours accelerates internal chemical degradation, leading to increased internal resistance and “puffing.” If you aren’t flying, use your charger’s “Storage” function to bring it to 3.85V.

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