KingSener NCR18650BF 3400mAh 3.6V 18650 flat-top cells 8PCS

8-cell pack for battery rebuilds

This pack contains eight KingSener NCR18650BF flat-top lithium-ion cells rated at 3400 mAh and 3.6 V nominal voltage. They are intended for technicians or experienced hobbyists rebuilding laptop battery packs or other devices that use 18650-format cells. The flat-top design matches the original Sanyo form factor for direct replacement.

Steady delivery through the discharge curve

Each cell offers a typical capacity of 3400 mAh with a minimum of 3250 mAh, so the pack maintains usable voltage well into the discharge cycle rather than collapsing after a brief burst. Standard charging follows a CC-CV profile at 1625 mA to 4.20 V and completes in about 3.5 hours, supporting consistent energy delivery over repeated cycles.

Low heat and stable operation in normal use

The 18 mm by 65 mm cylindrical cells generate minimal heat during typical charge and discharge currents, keeping internal pack temperatures low and fan noise absent. With no integrated electronics, power draw is limited to the cell chemistry itself, and the supplier notes stable capacity retention when stored above 80 % charge and kept out of hot or humid environments.