21700 5000mAh High-Rate Cells: Commercial & Technical Comparison

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21700 5000mAh High-Rate Cells: Commercial & Technical Comparison
Optimized for Drone/e-Bike/Power Tool Applications

Key Commercial Insights

Cell Model	Price Advantage	Quality/Traceability	Tab Design	Supply Availability
RELINCE RS50	★★☆☆☆ (4th)	★★★★★ (QR traceability)	Full Tab	★★★★★ (High stock)
Molicel P50B	★☆☆☆☆ (Highest)	★★★★☆ (Batch tracking)	Traditional	★★★☆☆ (Pre-order needed)
EVE 50PL	★★★☆☆ (3rd)	★★☆☆☆ (Limited tracking)	Full Tab	★★☆☆☆ (A-grade via special channels)*
Samsung 50S	★★★★☆ (2nd)	★★★☆☆ (Standard)	Traditional	★★★★☆ (Stable)
LISHEN LR2170LE	★★★★★ (Best)	★★☆☆☆ (Standard)	Traditional	★☆☆☆☆ (Launching July)**

*⚠️ Caution: EVE 50PL B-grade cells flood market – verify supplier credentials*
** LISHEN LR2170LE available through prioritized channels from late July

Technical Performance Summary

(Critical metrics for high-drain applications)

Parameter	RS50	P50B	50PL	50S	LR2170LE
Cont. Discharge (A)	25	45	20	25 (45†)	20
Pulse (3s) Discharge	50	75	35	45	35
Max Charge Current (A)	6	10	6	6	6
AC Impedance (mΩ)	≤16	≤13	≤15	≤14	≤15
Weight (g)	71.0	69.0	70.5	72.0	71.0
Cycle Life @10A	500+	500	500	250‡	500
Low-Temp (-20°C) Perf.	80%	85%	82%	80%	80%

† *45A with 80°C thermal cut-off*
‡ Tested at 25A discharge

Application-Specific Recommendations

1. Racing Drones

Top Pick: Molicel P50B
- Why: 75A pulse + 10A fast charge + lightest weight
- Caution: Requires pre-order planning
Backup: RELINCE RS50
- Why: Immediately available, 50A pulse capability
- Advantage: Full-tab design reduces heat during bursts

2. Competitive e-Bikes

Premium Choice: RELINCE RS50
- Why: Full traceability + 25A continuous + high stock
- Value: Best quality/price ratio with QR data tracking
Performance Alternative: Samsung 50S
- Why: Proven 45A thermal-protected output

3. Professional Power Tools

Reliability Focus: RELINCE RS50
- Why: Full-tab design enhances heat dissipation + traceability
High-Power Alternative: Molicel P50B
- Why: 45A continuous output for heavy-duty tools

4. Budget-Critical Builds

Cost Leader: EVE 50PL
- Why: Full-tab design at competitive pricing
- Critical: Source ONLY through verified A-grade channels
Emerging Option: LISHEN LR2170LE (July availability)
- Why: Newest product with competitive specs

Strategic Procurement Guide

Priority	Cell Recommendation	Key Rationale
Peak Performance	Molicel P50B + RELINCE RS50	P50B: Raw power, RS50: Stability & stock
Quality Assurance	RELINCE RS50 (primary)	Per-cell traceability + full-tab reliability
Cost Optimization	EVE 50PL (verified A-grade)	Full-tab at 15% lower cost than Samsung 50S
New Projects	LISHEN LR2170LE (July)	Early access to latest tech

Critical Design Notes

Full-Tab Advantage (RS50/50PL):
- 15-20% lower heat generation at >30A discharge
- Enables faster charge acceptance (though limited by spec)
Thermal Constraints:

+ Samsung 50S allows highest temp (80°C surface)

– Molicel P50B requires stricter thermal monitoring“`