Efest IMR18500 1100mAh 3.7v  Li-Mn Rechargable Battery 

• Brand Name: Efest
• Size: 18500
• Model: AV18500IMR
• Type: Li-Mn (High Drain)
• Rated Capacity: 1100mAh
• Nominal Voltage: 3.7V
• Peak Voltage: 4.2V
• Dimensions: 18.1mmX50mm
• Rechargable: Yes
• Protected: Not rquired for Li-Mn chemistry
• Chemistry: Lithium manganese Dioxide (Li-Mn02) 
• Style: Flat Top (may require a magnetic spacer)
• Color: Red

NOTE: Use special caution when working with Li-ion cells, they are very sensitive to charging characteristics and may explode or burn if mishandled. Make sure the user has enough knowledge of Li-Ion rechargeable batteries in charging, discharging and assembly before use. Always charge in/on a fire-proof surface. Never leave charging batteries unattended. We are not responsible for damage if there is any modification of the batteries/chargers in any form or shape (including pack making). We are not responsible for any damage caused by misuse or mishandling of Li-Ion batteries and chargers. We only recommend using Lithium Ion rechargeable batteries with a control circuit (protection PCB) to assure safe charge, discharge, etc, use of lithium ion batteries with a protection circuit is potentially hazardous.