2-Power pääakku - akku - 61 mAh (2P-266J9)

Field technicians replacing the tiny power cell in a wireless sensor or wearable medical patch need a battery that fits perfectly and delivers reliable voltage. The 2-Power 2P-266J9 is a single-cell lithium-ion rechargeable battery pack with a nominal 3.7 V output and 61 mAh capacity, engineered for compact electronics where space is at a premium. Its solder tab terminals allow direct integration into custom PCB assemblies, while the stable chemistry supports hundreds of charge cycles.

Key specifications

• Battery chemistry: Lithium-ion (Li-ion)
• Nominal voltage: 3.7 V
• Capacity: 61 mAh
• Energy: 0.226 Wh
• Form factor: Miniature cell (button or small pouch)
• Number of cells: 1
• Terminal type: Solder tabs / bare contacts
• Charging voltage (max): 4.2 V
• Discharge cut-off voltage: 2.75 V
• Cycle life: Up to 500 cycles
• Operating temperature range: -20°C to 60°C
• Self-discharge rate: < 5% per month
• Certifications: CE, RoHS compliant

Why choose it

This battery pack delivers consistent power in a minimal footprint, making it ideal for devices where every millimetre counts. The lithium-ion chemistry provides a high energy density and low self-discharge, so your device stays powered longer between charges. Solder tabs simplify assembly, and the wide operating temperature range ensures performance in challenging environments.

Ideal use cases

• IoT sensor nodes and edge devices
• Wearable health monitors and fitness trackers
• Medical sensors and disposable diagnostic tools
• Small industrial telemetry units
• Backup power for real-time clocks and memory

Good to know

For best results, charge the cell at a constant current/constant voltage (CC/CV) profile up to 4.2 V and avoid discharging below 2.75 V. Store in a cool, dry place at approximately 40% charge for long-term shelf life. Always follow local regulations for battery disposal and recycling.