
Why Consider an Alternative?
Molicel’s INR21700-P50B has faced critical supply disruptions following a production facility fire, extending lead times to 40+ days (with further delays anticipated). To safeguard your production continuity and cost efficiency, we propose Reliance INR21700-RS50 as a technically superior, cost-effective, and readily available alternative.

Performance Comparison: RS50 vs. P50B
Parameter | Reliance RS50 | Molicel P50B | Advantage |
---|---|---|---|
Capacity | 4950mAh (min.) | 4850mAh (min.) | +2% higher capacity |
Max Continuous Discharge | 70A (with 80°C cutoff) | 60A | 17% higher current |
Low-Temp Performance | -40°C@5A (85% capacity) | -30°C@4.07Ah (to 2.0V) | Superior cold tolerance |
Cycle Life | 600 cycles @40A: ≥87.7% retention | 500 cycles @20A: ≥70% | Longer high-rate lifespan |
AC Internal Resistance | ≤4.0mΩ (1kHz) | ≤8.0mΩ (1kHz) | 50% lower IR |
Fast Charge Support | 15min to 80% SOC (20A step protocol) | 1.5h (standard) | 3x faster charging |
Key Highlights:
✅ Ultra-Low Temp Operation: RS50 delivers 40A@-20°C (100% SOC) vs. P50B’s 20A@-20°C.
✅ Safety Compliance: Passes rigorous tests (20A/20V overcharge, 130°C heating, UN38.3 vibration).
✅ Higher Energy Density: 4950mAh vs. 4850mAh at similar dimensions (Ø21.35mm x 70.30mm).
Supply Chain & Cost Advantages
Factor | Reliance RS50 | Molicel P50B |
---|---|---|
Lead Time | Stable, ≤15 days | 40+ days (escalating) |
Pricing | 15-20% lower (volume-based) | Premium due to scarcity |
Risk Mitigation | Dedicated production lines in China | Fire-impacted Canadian facility |
Cost Savings Example:
For an annual demand of 100K cells:
P50B: ~$4.5/cell → $450,000
RS50: ~$3.40/cell → $340,000
→ $110,000 annual savings + guaranteed supply.
Why RS50 is a Drop-in Replacement?
Mechanical Compatibility:
Identical form factor (21700 cylindrical).
Near-identical weight (RS50: ≤67g vs. P50B: ≤70g).
Electrical Compatibility:
Same voltage profile (3.6V nominal, 4.2V max charge).
Seamless integration with existing PCM/protection circuits.
Application Suitability:
Optimized for high-demand use cases:
Power tools, drones, EVs, energy storage.
Explicitly prohibited for e-cigarettes (aligns with P50B’s restrictions).

Transition Support from Reliance
Free Samples & Testing Kits: Validate RS50 in your existing packs.
Technical Collaboration: Customized PCM tuning for optimized performance.
Inventory Buffering: Priority allocation for urgent orders.
Conclusion: Act Now to Secure Supply
Reliance RS50 offers equal or superior performance at a lower cost, with zero supply chain risk. As Molicel’s recovery timeline remains uncertain, transitioning to RS50 ensures uninterrupted production and enhanced product reliability.
Next Steps:
Request samples/testing data: Contact us
Discuss volume pricing & delivery schedules.
Don’t let supply chain volatility disrupt your business—switch to reliability today.
In order to more easily find the 21700 5000mAh 45A/60A/70A battery, we have summarized the high-rate batteries with a capacity of 5000mAh available on the market and conducted comparative tests on them. If you are interested, you can contact us to obtain the quotations.
