Streamlight SL-B2 22121 Rechargeable Battery 3.2V Lithium Ion

The Streamlight SL-B2 22121 rechargeable battery delivers consistent 3.2-volt power for compatible Streamlight tactical flashlights and weapon lights. This lithium-ion battery pack eliminates the ongoing cost and inconvenience of disposable batteries while maintaining peak illumination performance.

What Makes This Different

Unlike standard CR123A batteries that lose power gradually and require frequent replacement, the SL-B2 maintains consistent voltage output throughout its discharge cycle. The integrated charging circuit prevents overcharging damage, while the lithium-ion chemistry provides up to 500 charge cycles. Temperature stability ranges from -4°F to 140°F, ensuring reliable operation in extreme conditions where disposable batteries often fail.

Key Features

• 3.2-volt lithium-ion rechargeable battery with integrated protection circuit
• Compatible with Streamlight ProTac HL-X, ProTac Rail Mount series, and other SL-B2 compatible lights
• Up to 500 charge cycles for long-term cost savings over disposable batteries
• Consistent voltage output maintains full brightness throughout battery life
• Built-in charging port eliminates need for external charger
• Temperature rated from -4°F to 140°F for reliable cold weather performance
• Overcharge and over-discharge protection prevents battery damage

Field testing shows the SL-B2 maintains 90% of its original capacity after 300 charge cycles, significantly outperforming standard rechargeable alternatives. Law enforcement and military users report consistent performance during extended operations, while hunters appreciate the cold weather reliability during early morning hunts. The battery's voltage regulation ensures weapon-mounted lights maintain consistent zero and beam pattern.

Technical Specs

• Voltage: 3.2V nominal
• Chemistry: Lithium Iron Phosphate (LiFePO4)
• Cycle life: Up to 500 charge/discharge cycles
• Operating temperature: -4°F to 140°F (-20°C to 60°C)
• Charging method: Integrated USB charging port
• Protection: Over-charge, over-discharge, and short circuit protection
• Compatibility: Streamlight ProTac HL-X, ProTac Rail Mount 1, ProTac Rail Mount 2
• Dimensions: Standard 18650 form factor
• Country of origin: China
• Warranty: Limited lifetime warranty

Professional users choose the SL-B2 for its proven reliability and long-term value. The integrated protection circuit and temperature stability make this battery suitable for duty use, while the 500-cycle lifespan provides years of dependable service.