You’re holding two 18650 batteries in your hands. One is a Samsung 30Q. The other is a Molicel P30B. Both look similar. Both claim 3000mAh capacity. But they are not the same battery.
If you pick the wrong one, your mech mod might feel weak. Your drone might sag under load. Or worse, you could overstress a battery that wasn’t designed for your device.
We’ve tested both cells extensively. Here is the honest, real-world comparison you need to make the right choice.
Quick Summary: The One-Sentence Answer
Buy the Samsung 30Q if you want a reliable, budget-friendly battery for everyday use – vapes under 80W, flashlights, and power tools. It lasts longer and costs less.
Buy the Molicel P30B if you need extreme power – mechanical mods, racing drones, or any device that pulls over 20A continuously. It costs more, but it delivers what no other 18650 can.
Key Specifications Comparison
| Parameter | Samsung 30Q (INR18650-30Q) | Molicel P30B (INR18650-P30B) |
|---|---|---|
| Nominal Capacity | 3000mAh (tested 3112mAh+) | 3000mAh |
| Continuous Discharge (Official) | 15A | 25A |
| Continuous Discharge (Mooch tested) | 20A | 25A |
| Max Pulse Current | 20A | 40A |
| Internal Resistance | ~22mΩ | ~12mΩ |
| Cycle Life (to 80% capacity) | 400+ cycles | ~250 cycles |
| Best Use Case | Mid-power devices, daily use | Extreme high-drain, performance builds |
| Price | View the product page | View the product page |
| Counterfeit Risk | Very high | Medium |
Note: Data based on Mooch's independent testing and real-world feedback. Samsung 30Q exceeds its rated capacity in real tests. Molicel P30B has lower internal resistance, making it superior for high-current applications.
Samsung 30Q: The Everyday Workhorse
The Samsung 30Q is the most popular 18650 battery in enthusiast circles for a reason. It just works.
What we liked:
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Real capacity is higher than advertised. We tested multiple authentic cells and got 3112mAh on average.
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Excellent cycle life. After 400 charging cycles, it still holds about 85% of its original capacity.
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Great value. It costs significantly less than the P30B.
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Runs cool at moderate loads. At 20A, it stays around 45°C.
Where it falls short:
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Higher internal resistance (~22mΩ) means noticeable voltage sag under heavy loads.
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Not suitable for extreme high-drain applications. Pushing it past 20A is risky.
Best for: Daily vapers, flashlight users, DIY battery pack builders, and anyone who prioritizes longevity over peak power.
Molicel P30B: The High-Drain King
Molicel has over 45 years of lithium-ion experience. The P30B is their flagship cell, built for one thing: raw power.
What we liked:
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Ultra-low internal resistance (~12mΩ). Almost no voltage sag, even at high currents.
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True 25A continuous discharge with 40A pulse capability. It handles extreme loads effortlessly.
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Runs cooler than the 30Q under identical loads. At 20A, the P30B stayed around 38°C.
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Excellent batch-to-batch consistency.
Where it falls short:
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Shorter cycle life. Expect about 250 cycles before capacity drops to 80%.
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Higher price. You're paying a premium for that extra performance.
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Requires proper heat dissipation in extreme use cases.
Best for: Mechanical mod users, drone racers, high-performance custom pack builders, and enthusiasts who demand maximum power.
Real-World Usage Guide
| Use Case | Recommended Battery | Why |
|---|---|---|
| Mech mods (80W-150W) | Molicel P30B | Needs 25A+ continuous to avoid voltage sag |
| Regulated vapes (30W-60W) | Samsung 30Q | 15A-20A is enough; better cycle life and value |
| High-lumen flashlights (10A continuous) | Samsung 30Q | Higher real capacity means longer runtime |
| Drone racing (peak >30A) | Molicel P30B | 40A pulse keeps your drone responsive |
| Power tool packs (2-5 cells in series) | Samsung 30Q | Longer cycle life = less replacement |
| Custom high-power packs (>100A) | Molicel P30B | Low IR allows better multi-cell balancing |
Buying Guide: How to Spot Fakes
Fake 18650 batteries are dangerous. Use this checklist to verify authenticity.
| Check | Samsung 30Q (Authentic) | Molicel P30B (Authentic) |
|---|---|---|
| Weight | ~46g (fakes are lighter) | ~48g |
| Top cap | Flat with clean thin protection ring | Deep clean circular indentation |
| Engraving | Clear, fine lettering | Smooth glossy wrapper, crisp font |
| Internal resistance | ~22mΩ (fake >30mΩ) | ~12mΩ (fake >20mΩ) |
| Buy from | Authorized dealers only | Authorized dealers only |
Important: Never buy 18650 batteries from Amazon, eBay, or unknown third-party sellers. OneAndes offers 100% authentic A-grade cells with full traceability.
Frequently Asked Questions
1. Can I mix Samsung 30Q and Molicel P30B in the same pack?
No. Different internal resistance and discharge capabilities will cause cell imbalance, reducing performance and creating safety risks.
2. Which battery has better cycle life?
Samsung 30Q. It retains ~85% capacity after 400 cycles, while Molicel P30B drops to 80% after ~250 cycles.
3. Is Molicel P30B safer than Samsung 30Q?
Both have solid safety mechanisms. However, P30B requires better thermal management at extreme loads. At 20A load, P30B runs cooler than 30Q.
4. Which battery should I get for vaping?
For mech mods or high-power regulated devices (80W+), choose Molicel P30B. For regulated mods under 60W, Samsung 30Q is more cost-effective.
5. Where can I buy authentic cells?
Only from trusted, authorized sources like OneAndes. Browse our High Drain 18650 collection or grab a Molicel P30B 4-pack.
Final Verdict: Which One Should You Buy?
| If you... | Choose... |
|---|---|
| Want the best value for money | Samsung 30Q |
| Need the longest cycle life | Samsung 30Q |
| Use moderate power (≤20A) | Either, but Samsung is cheaper |
| Need extreme power (>20A) | Molicel P30B |
| Build flashlights for long runtime | Samsung 30Q |
| Build mech mods or race drones | Molicel P30B |
For 90% of users, the Samsung 30Q is more than enough. It's reliable, long-lasting, and budget-friendly.
But if you need every last amp of performance, the Molicel P30B is the clear winner.
Both are excellent batteries. Just make sure you buy authentic ones.
Ready to buy?
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✅ Samsung 30Q – [Shop now at OneAndes]
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✅ Molicel P30B – [Shop now at OneAndes]
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✅ Browse all 18650 batteries – [Visit OneAndes]
OneAndes guarantee: Every cell is 100% authentic, A-grade, and fully traceable. No fakes. No surprises.