The high-quality Panasonic 18650 Li-ion battery with 3500mAh features a triple protection circuit against overcharging, deep discharge, and short circuit. These 3400mAh Li-ion batteries are made from premium Panasonic 18650 Li-ion cells and come with a built-in, high-quality protection circuit to handle high currents. The maximum charging current is 3A, and the maximum discharge current is approximately 11A. Please be cautious if other Li-ion 18650 batteries claim capacities of 4000mAh, 5000mAh, or even 6000mAh. Paper is patient. Our 18650 batteries are sourced as new Panasonic branded cells and equipped with high-quality protection circuits. They are very well suited as a power source for high-quality Fenix LED flashlights such as TK11, TK12, TK15, TK21, TK30, TK35, PD31, PD32, TA20 (only current model), TA21, and TK75. Please note that the battery is not compatible with Nitecore LED lamps.

Technical specifications:

• System: Li-ion battery with triple protection circuit
• Form factor: 18650
• Capacity: 3500mAh
• Nominal voltage: 3.7 Volt
• Standard charging current: 1700mAh
• Standard discharge current: 680mAh
• Standard discharge cut-off voltage: 3.5 Volt
• Diameter: 18.40mm
• Length: 68.66mm +/- 0.2mm
• Maximum continuous current draw: 10A
• Integrated electronics for protection against deep discharge, short circuit, and excessive current draw

Voltage-state of charge for Lithium batteries:

• 4.2V - 100%
• 4.1V - 87%
• 4.0V - 75%
• 3.9V - 55%
• 3.8V - 30%
• 3.5V - 0%

General safety instructions: Please do not leave the batteries unattended while charging, always use batteries from the same manufacturer and of the same type together. When using multiple batteries, they should always be used and charged together. Use a high-quality charger and, if possible, remove the cells after the charging process. Important: Keep the battery voltage above.