What Is 21700 Button Top Battery?

21700 button top battery is a rechargeable lithium-ion cell (typically 3.7V) with a raised positive terminal. Compared to flat-top batteries, it’s designed for better compatibility with:

• Flashlights
• Medical devices
• Portable electronics
• Battery packs requiring stable contact

The “21700” refers to size:

• 21mm diameter
• 70mm length

Most mainstream models today come with 5000mAh capacity, making them a popular upgrade over 18650 batteries.

Why 5000mAh 21700 Batteries Are Dominating the Market

Bulk buyers are increasingly shifting to 21700 cells, especially 5000mAh versions. Here’s why:

1. Higher Energy Density

A 5000mAh 21700 battery stores significantly more energy than a typical 18650 (2500–3500mAh), meaning:

• Longer runtime
• Fewer battery replacements
• Lower total cost in the long run

2. Better for High-Drain Devices

These batteries are widely used in:

• Industrial tools
• High-lumen flashlights
• Power storage systems

Button Top vs Flat Top: What Wholesale Buyers Should Know

Feature	Button Top	Flat Top
Compatibility	Wider (plug-and-play)	Limited
Safety	More stable contact	Requires precise fit
Use case	Consumer electronics	Battery packs / OEM

For resale markets (Amazon, distributors, retail), button top is easier to sell because it works in more devices.

Key Specs to Look for When Buying in Bulk

When sourcing 21700 button top batteries, don’t just look at price.

Capacity

• Standard: 4800–5000mAh
• Sweet spot: 5000mAh

Discharge Rate

• Low drain: 5–10A
• High drain: 15A+

Protection Circuit (PCB)

• Protected batteries = safer, slightly longer
• Unprotected batteries = cheaper, for pack assembly

Cycle Life

• Good cells: 500+ cycles

PRODUCT COMPARISON TABLE

Capacity

5000mAh

5000mAh

5000mAh

Protection

Yes

Yes

Yes

Charging

External

USB-C + External

External

Discharge Rate

~10A

~15A

~10–15A

Positioning

Mid-range

Premium

Budget bulk

Best For

Distributors

Retail / branded

Wholesale volume

Where to Source 21700 Button Top Batteries in Bulk

If you’re doing OEM, wholesale, or distribution, you’ll want a direct manufacturer instead of retail brands.

A typical product example:5000mah 21700 Button Top Batteries

This type of supplier usually offers:

• Bulk pricing (MOQ-friendly)
• Custom labeling / OEM
• Stable supply chain
• Consistent cell grading

Common Applications for 21700 Button Top Batteries

Wholesale buyers usually target these markets:

• Flashlight brands
• Outdoor gear distributors
• Medical device manufacturers
• Energy storage systems
• E-bike & power tool packs

Final Thoughts: How to Choose the Right Supplier

If you’re buying 21700 button top batteries in bulk, focus on 3 things:

• Consistency (same capacity across batches)
• Safety (PCB + certifications)
• Pricing vs quality balance

If your goal is resale → go branded or protected
If your goal is manufacturing → go OEM cells