21700 Flat Top Batteries

Flat top 21700 cells have a flush positive terminal — the terminal type built for pack assembly, not for standalone devices.

The flush top is the whole point for builders: it sits flat against nickel strip so your spot welds land clean and even, drops into cell holders without fuss, and packs tightly when you're stacking cells in series and parallel. A button top — with its raised positive contact — is made for devices that need that contact, and it gets in the way when you're building a pack.

So if you're welding up a custom 21700 pack of any kind, flat top is the terminal type you want. Reach for a button-top cell only when a specific device requires the raised contact.

Why builders choose them

• Flush terminal welds clean and even to nickel strip
• Fits holders and packs tightly in series/parallel
• The correct terminal type for custom pack building
• Spans high-drain and high-capacity 21700 cells

Built for

• Custom and DIY battery pack assembly
• Power-tool and e-mobility packs
• Energy storage and portable power
• Series/parallel high-output builds