These are FST 18650 2200mAh 3.6V Lithium Batteries. Reliable lithium batteries provide long lasting power to your devices. They deliver a steady charge and are leak resistant, durable, and have a long shelf life. Great for indoor and outdoor use, with its resistance to high temperatures. Provides exceptional continuous power source to your device, and ensures long power life. Pack of 4 batteries.

• Rechargeable FST 18650 2200mAh 3.6V Lithium-ion Batteries
• Compact, lightweight, powerful high energy density design, long service life
• Retains power longer than traditional batteries, long shelf life
• Excellent continuous power sources to your device
• Steady reliable current is ensured
• Pack of 4 batteries