Powertac 5000mAh 21700 Rechargeable Li-ion Battery with PCB Protection

More Capacity. Longer Runtime. Same Powertac Quality.

The Powertac 5000mAh 21700 Rechargeable Li-ion Battery delivers significantly more capacity than a standard 18650 — meaning longer runtime between charges on compatible flashlights. Built with internal PCB protection to prevent over-voltage, under-voltage, and short circuits, so your light and your battery stay protected.

Important: The 21700 is physically larger than the 18650. It is NOT a drop-in replacement for 18650-compatible lights. Check your flashlight's compatibility before ordering.

Compatible With

Powertac flashlights and devices specifically designed for the 21700 battery format. If you're unsure, contact us before ordering.

Key Specifications

• Capacity: 5000mAh
• Voltage: 3.6V nominal
• Format: 21700 (larger than 18650 — not interchangeable)
• Cycle Life: 500+ cycles
• Protection: Internal PCB (over-voltage, under-voltage, short circuit)
• Standard: Manufactured under ISO9001-2000, tested to IEC standards

PCB Protection Features

• Over-voltage protection: Prevents overcharging.
• Under-voltage protection: Prevents deep discharge damage.
• Short circuit protection: Safeguards your flashlight's electronics.

Authorized Powertac dealer. Genuine battery backed by Powertac's limited 30-day warranty (receipt required).