BAK N18650COP 18650 Battery Cell 3.6V 2500mAh 2.5Ah Li-ion Rechargeable

BAK N18650COP lithium-ion cells — a dependable 18650 for DIY battery packs, power tool rebuilds, flashlights, and electronics projects. A widely used stand-in for the discontinued Samsung 25R. Cells only; buy 1, 2, 4, or 8.

Choose your quantity

• 1 cell
• 2 cells
• 4 cells
• 8 cells — best per-cell price

Looking for a storage case? We sell clear protective cases separately in 2-cell and 4-cell sizes.

Specifications

• Model: BAK N18650COP
• Cell type: 18650 Li-ion, rechargeable
• Nominal voltage: 3.6V
• Capacity: 2500mAh (2.5Ah)
• Terminal: Flat top (unprotected)
• Condition: New

Common uses

DIY battery pack builds, power tool pack rebuilds, flashlights, portable power banks, and general electronics projects needing reliable 18650 cells.

Important safety information

These are bare, unprotected cells intended for battery builders and experienced users. They are not drop-in replacements for protected cells.

• Use a proper BMS/PCM when building packs
• Do not short-circuit, crush, puncture, or expose to heat
• Never charge unattended
• Never use cells with damaged wrappers — rewrap before use
• When building packs, use cells of matched capacity and internal resistance
• Verify size and electrical requirements for your project before ordering

Ships carefully packaged to protect the cells in transit. Need larger quantities? Message us about bulk options.

Building or rebuilding battery packs? For cells, nickel strip, BMS boards, insulation rings, and other rebuild supplies, browse the rest of the RenewSpark store.

Assembly and use are at your own risk. See our Terms of Service for full details.