PK Cell Lithium Batteries
PK Cell Lithium-Ion Batteries - Professional-Grade Rechargeable Cells with Verified Specifications
Verified Capacity. Honest Specifications. PK Cell lithium-ion batteries deliver genuine rated capacity for power banks, flashlights, e-bikes, and DIY battery packs. As battery specialists since 2010, we supply cells with actual minimum capacity guarantees and complete technical documentation - no inflated marketing claims.
PK Cell Battery Lineup at a Glance
18650 Format (3500mAh)
Maximum Capacity: 3500mAh typical (3325mAh minimum)
Best For: E-bikes, solar storage, extended runtime applications
Charge Time: ~7 hours at 0.2C rate
18650 Format (3000mAh)
Balanced Performance: 3000mAh typical (2850mAh minimum)
Best For: Power banks, flashlights, daily cycling
Charge Time: ~4 hours at 0.5C rate
14500 Format (800mAh)
AA-Size 3.7V: 800mAh typical (720mAh minimum)
Best For: Compatible flashlights, solar lights
Charge Time: ~4 hours at 0.5C rate
Complete PK Cell Battery Specifications Comparison
| Specification | ICR18650 3500mAh |
ICR18650 3000mAh |
ICR14500 800mAh |
|---|---|---|---|
| Format / Size | 18650 Cylindrical | 18650 Cylindrical | 14500 (AA-size) |
| Nominal Voltage | 3.7V | 3.7V | 3.7V |
| Typical Capacity | 3500mAh | 3000mAh | 800mAh |
| Minimum Guaranteed | 3325mAh | 2850mAh | 720mAh |
| Energy Content | 12.95Wh | 11.1Wh | 2.96Wh |
| Max Continuous Discharge | 5250mA (1.5C) | 4500mA (1.5C) | 1200mA (1.5C) |
| Standard Charge Rate | 0.2C (700mA) | 0.5C (1500mA) | 0.5C (400mA) |
| Charge Time (Standard) | ~7 hours | ~4 hours | ~4 hours |
| Cycle Life (80% capacity) | ≥300 cycles | ≥300 cycles | ≥300 cycles |
| Discharge Cut-off | 2.75V | 2.5V | 3.0V |
| Dimensions (Dia × Length) | 18mm × 65mm | 18.2mm × 65mm | 14.2mm × 49mm |
| Temperature Range (Discharge) | -20°C to 60°C | -20°C to 60°C | -20°C to 60°C |
Why Choose PK Cell Lithium-Ion Batteries
✓ Verified Minimum Capacity Guarantees
Every PK Cell battery includes both typical and minimum capacity specifications - the 3500mAh cell guarantees minimum 3325mAh versus competitors claiming 4000mAh that actually test at 2400mAh. This transparency enables accurate battery pack design calculations without safety margin guesswork.
✓ Complete Technical Documentation
Comprehensive datasheets include actual charge profiles, temperature derating curves, cycle life testing methodology, and safety test results. Professional builders receive the technical data necessary for proper BMS selection, thermal management design, and realistic performance projections.
✓ Consistent Cell Matching Available
Batch-matched cells within 50mAh capacity variance available for multi-cell pack assembly. Consistent internal resistance and capacity distribution eliminates the common pack imbalance issues that occur when mixing cells from different production runs or manufacturers.
✓ ICR Chemistry Energy Density
Lithium Cobalt Oxide (ICR) chemistry provides maximum energy density for applications under 2C discharge rate. Where runtime matters more than peak power output, ICR cells deliver superior watt-hours per unit volume compared to INR chemistry alternatives.
✓ RoHS Compliant Construction
All PK Cell batteries meet RoHS environmental compliance standards for restricted substances. Documentation available for commercial applications requiring material composition verification and regulatory compliance confirmation for resale or integration projects.
✓ Optimal Storage Voltage Shipping
Cells ship at 3.7-3.85V storage voltage (approximately 50% state of charge) for maximum shelf life. This voltage range minimizes capacity degradation during shipping and storage, unlike cells shipped at full charge experiencing accelerated aging before first use.
Expert Technical Support for Your Battery Project
As battery specialists since 2010, we've supported thousands of DIY battery pack projects with technical guidance beyond basic datasheets. Our team understands the critical differences between capacity ratings, discharge specifications, and real-world performance expectations that separate successful projects from frustrating troubleshooting scenarios.
Pre-Purchase Consultation
Capacity calculations, BMS selection guidance, and realistic performance projections for your specific application requirements
Cell Matching Services
Batch-matched cells within specified capacity variance for balanced pack performance and extended service life
Pack Design Review
Configuration verification, thermal management assessment, and safety system recommendations based on field experience
Troubleshooting Support
Post-assembly guidance for capacity testing, balance charging, and performance optimization for completed battery packs
Critical Lithium-Ion Battery Safety Requirements
Professional battery pack construction requires technical knowledge and appropriate safety equipment. We document these requirements transparently because proper lithium-ion handling protects both builders and end-users from preventable safety incidents.
Protection Systems Mandatory
BMS (Battery Management System) required for all multi-cell configurations - must include overcharge protection (4.2V max), over-discharge protection (2.5-3.0V min), and temperature monitoring for thermal management
Charging Requirements
Dedicated lithium-ion charger with CC/CV profile and 4.2V ±0.05V termination voltage required - NiMH chargers (1.4V termination) or non-compatible chargers create overcharge conditions and safety hazards
Handling Precautions
Always use insulating wraps and proper spacers in pack assembly - bare cell contact causes short circuits exceeding safe discharge limits, potentially igniting electrolyte vapors and compromising adjacent cells
Storage Guidelines
Store at 3.7-3.85V (40-50% state of charge) in temperature-controlled environment 15-25°C - storage at full charge or elevated temperatures accelerates capacity degradation (10-15% loss within 6 months)