This 1.2V 40mAh Ni-MH button cell offers reliable rechargeable power in a compact form factor. Designed for PCB mounting, it’s ideal for backup power in clocks, calendars, timers, and low-duty embedded circuits. With over 500 charge cycles and low self-discharge, it ensures long-term stability in standby applications.

Specifications

• Chemistry: Nickel-Metal Hydride (Ni-MH)
• Nominal Voltage: 1.2 V DC
• Capacity: 40 mAh
• Charge Cycles: ≥ 500 cycles (typical)
• Standard Charge Current: ~4 mA for 14–16 hours
• Rapid Charge Current: ~20 mA for 2.5–3 hours (with temperature monitoring)
• Self-Discharge: ~10% per month at room temperature
• Mount Type: 2-pin PCB solder tabs
• Dimensions: Approx. 12 mm diameter × 5.4 mm height

Features

• Rechargeable button cell with compact footprint for embedded use
• PCB-mountable with pre-welded nickel tabs for secure soldering
• Mercury-free and RoHS compliant
• Ideal for RTC backup, EEPROM retention, and solar-powered devices
• Compatible with VARTA 1/V40H and similar Ni-MH coin cells
• Common use cases:
  • Clock/calendar modules
  • Memory retention in microcontrollers
  • Low-power timers and sensors
  • Solar garden lights and toys