21700 Battery 5550mAh Protected Button Top Li-ion Orbtronic Rechargeable 3.7V Best For High Performance Flashlight

21700 Battery 5550mAh Protected Button Top Li-ion Rechargeable 3.7V Best For High Performance Flashlight Orbtronic

Precision Fit. Powerful Output. Trusted Protection.

Looking for the sweet spot between capacity, safety, and compatibility? The ORB-5550P-21 delivers 5550mAh of real-world power in a protected 21700 format that fits where others struggle. Unlike oversized protected cells that cause fitment issues, this battery is dimensionally optimized for compartments designed for protected 21700 batteries-no squeezing, no guessing. It’s the perfect successor to our 5000mAh bestseller and a smarter choice than bulkier 6000mAh options that often struggle in tight builds.

⭐ Key Features

• 5550mAh of steady output with low voltage sag
• High discharge capability up to 15A (regulated by protection circuit)
• Advanced safety protection using Japanese and U.S. components
• Standard protected dimensions -fits most 21700 compartments
• Free Orbtronic protective case included

⚡ Performance Highlights

• Part Number: ORB-5550P-21
• Capacity: 5550mAh (typical), 20.3Wh energy
• Nominal Voltage: 3.6V–3.7V
• Discharge Limit: Up to 15A continuous
• Cycle Life: ≥80% capacity after 500 full charge/discharge cycles
• Temperature Range: −20°C to +60°C (−4°F to 140°F)

📊 Dimensions & Build

• Height: 74.6 mm ±0.3 mm (2.94 in)
• Diameter: 21.70 mm ±0.3 mm (0.846 in)
• Weight: ≤70 g (2.47 oz)
• Positive Terminal: Button Top (Welded)

⚔ Advanced Safety Protection

Most batteries say “Protected.” Orbtronic shows you how.

We use a precision-engineered safety circuit built with components from SEIKO‑Ablic (Japan) and Alpha & Omega Semiconductor (USA) -trusted in industrial and medical-grade electronics.

• Overcharge cutoff: 4.325V
• Overdischarge cutoff: 2.5V
• Overcurrent cutoff: ~15A
• Short-circuit response: ~320 microseconds
• Standby drain: ≤0.1μA

Circuit design includes multi-stage fault detection, triple-MOSFET layout for thermal balance, gold-plated PCB, pure nickel tabs, and humidity-tested assembly.

We monitor current directly -because heat follows current. Protection kicks in before thermal stress becomes a problem.

🔋 Charging & Compatibility

• Charging Voltage: 4.2V (CC-CV method)
• Recommended Current: 1A–2A
• Max Charge Current: Up to 5A (with thermal limits)
• Charge Cutoff Temp: 50°C (122°F)

Compatible with most quality 21700 chargers. Slightly longer than unprotected cells due to the protection circuit -check your device’s battery compartment before purchase.

📦 What’s Included

• One (1) ORB-5550P-21 Protected 21700 Battery
• One (1) Orbtronic Protective Case (holds two cells)
• Secure, professional packaging

⚠️ Important Safety Warnings

IMPORTANT SAFETY NOTICE: These are high-capacity, high-discharge lithium-ion batteries. To avoid potential safety risks, it's absolutely essential to use them correctly. Before use, please thoroughly review the provided safety guidelines and specifications for proper handling, charging procedures, and compatible devices. Mishandling these batteries can lead to significant hazards.

• AVOID SHORT CIRCUITS. Short circuits can cause fires, serious injuries, or damage to your device.
• Fully charge the battery to 4.2V before using it for the first time.
• Use only high-quality dedicated Li-ion chargers.
• Do not charge unattended or expose batteries to extreme temperatures.
• Store unused batteries in the provided plastic case.
• Never use with e-cigarettes, vaporizers, or similar devices.
• Immediately discontinue use if the battery is damaged or behaves abnormally.
• If there's resistance when inserting the battery, stop immediately and investigate the cause. Never use force.
• Keep out of reach of children and pets.
• Inspect your battery for physical damage, torn heat-shrink, or compromised terminal insulation before every use.

View Full Safety Instructions >>

🤔 Frequently Asked Questions