5000mAh 21700 Battery Cells

These are genuine BAK N21700CG-50 battery cells. They are not pulls, rewraps, or recycled cells. BAK is an established manufacturer that supplies cells for major e-bike and energy storage brands. These are perfect for battery pack builds, solar installs, e-bikes, and DIY power projects.

The backstory for these particular cells is they were purchased by an EV battery company that hoped to build hot-swappable battery packs for EVs to minimize charging times. As fast charging has gotten faster and faster, I don't think that panned out that well.

Each cell will arrive pre-charged to ~3.6V

📦 Specifications

• Model: BAK N21700CG-50
• Size 21700 (≈21×70 mm)
• Nominal Voltage: 3.60V
• Charge Voltage: 4.20V max
• Discharge Cutoff: 2.5V
• Capacity: Rated 5000 mAh
• Maximum Charge Current: 5A
• Max Continuous Discharging Current: 10A
• Chemistry: NCA Li-ion
• Top Type: Flat Top

🔋Applications

• Custom battery packs (e-bikes, scooters, power tools)
• Energy storage / solar backup systems
• High-capacity portable power / DIY UPS
• Hobbyist electronics needing reliable, large-capacity cells

> ⚠️ Disclaimer: Lithium ion batteries may explode or burn due to improper use. Using these batteries for purposes not intended by the manufacturer, including outside a battery pack and/or without a BMS, may cause severe injury and damage. I am not responsible for any injuries caused by lithium ion batteries - use at your own risk.