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BTW INR18650-26EC 18650 Li-ion Battery 3.7V 9.62Wh 2600mAh – Flat Top (Single Cell)

The BTW INR18650-26EC 18650 Li-ion Battery 3.7V 9.62Wh 2600mAh is a cylindrical lithium-ion rechargeable cell engineered for reliable energy delivery across a wide range of professional and industrial applications. This model is officially marked INR18650-26EC, rated at 3.7V nominal voltage, 9.62Wh energy, and 2600mAh capacity, supplied as one single individual cell with a flat-top terminal design.

This specification is confirmed exactly as follows:
✔ Brand: BTW
✔ Model: INR18650-26EC
✔ Capacity: 2600mAh
✔ Energy: 9.62Wh
✔ Nominal Voltage: 3.7V
✔ Format: 18650 cylindrical cell
✔ Configuration: Single Piece (1 Cell)
✔ Terminal Type: Flat Top

Product Identity & Classification

The BTW INR18650-26EC belongs to the INR chemistry category, which designates lithium nickel manganese cobalt oxide composition (Li-Ni-Mn-Co). This chemistry is widely adopted in modern energy systems due to its balance between:

• ⚡ Stable energy density
• 🔋 Reliable discharge characteristics
• ♻️ Rechargeable lifecycle performance
• 🛡 Controlled thermal behavior

The 18650 form factor refers to the standardized cylindrical dimension:

• Diameter ≈ 18mm
• Length ≈ 65mm

This geometry makes it compatible with battery holders, modular packs, and industrial assemblies designed for 18650 cells.

Core Electrical Specifications

Capacity & Energy Output

The 2600mAh capacity ensures stable current supply for medium-demand devices. The 9.62Wh energy rating reflects real usable stored energy based on nominal voltage and capacity.

Energy calculation reference:
3.7V × 2.6Ah ≈ 9.62Wh

This provides a balanced profile suitable for:

• 🔧 Power tool battery rebuilding
• 🚲 Electric mobility packs
• 🔌 Backup energy systems
• 🔋 Consumer electronics battery replacement

Internal Resistance Performance

With a declared internal resistance ≤ 13mΩ, this cell is optimized for:

• Efficient current delivery
• Reduced heat generation under load
• Improved voltage stability
• Better pack balancing consistency

Low internal resistance is critical in applications requiring steady current draw such as:

• Electric scooters
• E-bikes
• Power systems
• UPS assemblies

Charging & Discharging Parameters

Charging

• Maximum charge voltage: 4.2V ± 0.05V
• Standard charging temperature: 0°C to 55°C

Discharging

• Discharge cut-off voltage: 2.5V
• Operating discharge temperature: -20°C to 60°C

Storage

• Recommended storage temperature: 20°C to 45°C

These parameters ensure safe integration into BMS-controlled systems.

Physical Construction

The BTW INR18650-26EC features:

• 🟣 Cylindrical steel housing
• ➕ Clearly marked polarity indicators
• 🧾 Laser-printed model code & batch trace
• 📦 Industrial bulk packaging compatibility

The flat-top configuration allows:

• Spot-welding tab installation
• Direct holder mounting
• Modular pack integration

Application Scope

The BTW INR18650-26EC 2600mAh cell is suitable for:

• 🔧 Electric power tools
• 🛴 Electric scooters
• 🚲 Electric bikes
• 🏠 Home appliances
• 🧑‍💻 Consumer electronics
• ⚡ Uninterruptible power supplies (UPS)
• 🌞 Solar energy storage systems
• 🚗 Four-wheel electric vehicles
• 🏌 Golf carts
• 🌱 Electric lawn mowers
• ♿ Electric wheelchairs
• 🚜 Electric forklifts
• 🎮 Electric toy cars
• 🏭 Industrial battery systems

Safety & Handling Guidelines

• Use only with compatible Li-ion chargers (4.2V termination)
• Always integrate with a Battery Management System (BMS) in multi-cell packs
• Do not short circuit
• Do not puncture or crush
• Do not overcharge above 4.2V
• Do not discharge below 2.5V
• Store in moderate temperature conditions

Packaging Configuration

This listing includes:

📦 1 Piece – BTW INR18650-26EC 2600mAh Flat Top Cell

Performance Stability & Engineering Value

The BTW INR18650-26EC 18650 Li-ion Battery 3.7V 9.62Wh 2600mAh is engineered to provide consistent discharge behavior under standard and medium-load operational environments. With a nominal voltage of 3.7V and a controlled discharge cut-off at 2.5V, the cell maintains voltage stability across its operating curve.

Key electrical advantages include:

• ⚡ Stable nominal voltage output for regulated systems
• 🔋 Balanced 2600mAh capacity for multi-cell pack configuration
• 🔧 Suitable for serial and parallel assembly
• 🛡 Low internal resistance ≤ 13mΩ for reduced voltage sag
• ♻️ Rechargeable lithium-ion chemistry (INR type)

The flat-top design ensures seamless compatibility with:

• Battery holders
• Spot-welded tab assemblies
• Modular lithium packs
• Laptop battery rebuilding configurations

Thermal Operating Profile

The cell is specified for:

• 🔥 Charging temperature: 0°C to 55°C
• ❄ Discharge temperature: -20°C to 60°C
• 📦 Storage temperature: 20°C to 45°C

These defined ranges allow integration into controlled energy systems and BMS-regulated applications. Proper ventilation and pack engineering remain essential for optimal safety and lifecycle preservation.

Mechanical Characteristics

• 🔵 Cylindrical 18650 format
• ⚙ Steel can housing
• ➕ Flat positive terminal
• ➖ Standard negative base
• ⚖ Approximate weight: 46g ± 0.5g
• 📏 Standard 18650 dimension class (≈18mm × 65mm)

The robust casing protects internal lithium-ion layers from mechanical stress during assembly and pack integration.

Electrical System Integration

The BTW INR18650-26EC 2600mAh 9.62Wh cell integrates effectively into:

• 🔋 2S, 3S, 4S lithium battery packs
• ⚡ 12V, 24V, 36V system architectures
• 🔌 Portable backup systems
• 🛠 Industrial tool battery rebuilds
• 🌞 Solar storage arrays
• 🚲 E-mobility modules

Each configuration must include proper:

• BMS protection
• Cell balancing
• Overcurrent control
• Thermal management

Use Case Engineering Categories

The 2600mAh capacity positions this model for:

Consumer Applications

• 🔦 Flashlights
• 💻 Laptop battery rebuild
• 🎮 Portable electronics
• 🧰 DIY battery packs

Mobility Applications

• 🛴 Electric scooters
• 🚲 E-bikes
• ♿ Electric wheelchairs
• 🏎 Electric toy vehicles

Industrial & Power Systems

• 🔋 UPS systems
• 🌞 Solar storage systems
• 🏗 Electric forklifts
• 🌱 Electric lawn mowers
• 🏌 Golf carts
• ⚡ Electric vehicle submodules

Compliance & Identification

The product marking confirms:

• BTW branding
• INR18650-26EC model code
• 3.7V nominal voltage
• 9.62Wh energy
• 2600mAh capacity
• Individual serial trace marking

This ensures authenticity verification and batch tracking in commercial or industrial purchases.

Included in This Listing

📦 Quantity: 1 Piece Only
🔋 Model: BTW INR18650-26EC
⚡ Capacity: 2600mAh
🔌 Energy: 9.62Wh
🔋 Voltage: 3.7V
🔘 Terminal: Flat Top

Not included:

• Protection board
• Tabs
• Charger
• BMS
• Multi-pack assembly

بطارية BTW INR18650-26EC ليثيوم أيون 18650 – 3.7V 9.62Wh 2600mAh فلات توب (قطعة واحدة)

بطارية BTW INR18650-26EC هي خلية ليثيوم أيون أسطوانية قياس 18650 بسعة مؤكدة 2600mAh وطاقة 9.62Wh وجهد اسمي 3.7 فولت، تصميم طرف موجب فلات (Flat Top)، وتباع كقطعة واحدة منفردة.

المواصفات المؤكدة:

• العلامة التجارية: BTW
• الموديل: INR18650-26EC
• السعة: 2600mAh
• الطاقة: 9.62Wh
• الجهد الاسمي: 3.7V
• الشكل: 18650 أسطواني
• النوع: Li-ion (INR)
• التكوين: قطعة واحدة

المواصفات الكهربائية

درجات الحرارة

• حرارة الشحن: 0° حتى 55° م
• حرارة التفريغ: -20° حتى 60° م
• حرارة التخزين: 20° حتى 45° م

التصميم والبنية

• هيكل فولاذي أسطواني
• طرف موجب فلات
• طباعة موديل ورقم تتبع
• مناسب للحام بالنقاط أو حوامل البطاريات

الاستخدامات

• أدوات كهربائية
• دراجات كهربائية
• سكوترات كهربائية
• أنظمة UPS
• تخزين طاقة شمسية
• كراسي متحركة كهربائية
• سيارات ألعاب كهربائية
• جزازات عشب كهربائية
• عربات جولف
• أنظمة طاقة صناعية

تعليمات السلامة

• استخدام شاحن ليثيوم 4.2V فقط
• لا يتم الشحن فوق 4.2V
• لا يتم التفريغ تحت 2.5V
• استخدام BMS عند تجميع أكثر من خلية
• عدم التعريض للحرارة الزائدة أو الثقب

محتويات العبوة

📦 قطعة واحدة فقط من
🔋 BTW INR18650-26EC
⚡ 2600mAh
🔌 9.62Wh
🔘 Flat Top

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