VARTA NiMH Button Cell V40LF with Solder Pins (55604201046)

Engineers and technicians working on compact electronics often need a reliable, rechargeable power source that fits into tight spaces. The VARTA NiMH Button Cell V40LF is a 1.2 V nickel-metal hydride cell with solder pins, designed for direct PCB mounting in memory backup, medical devices, and portable instruments. Its 40 mAh capacity and up to 1000 charge cycles make it a durable choice for long-term use.

Key specifications

• Chemistry: Nickel-Metal Hydride (NiMH)
• Nominal voltage: 1.2 V
• Nominal capacity: 40 mAh
• Energy content: 0.048 Wh
• Form factor: Button cell with solder pins
• Diameter: 15.5 mm; Height: 6.0 mm
• Standard charge current: 4 mA (C/10), 14–16 hours
• Cycle life: up to 1000 cycles
• Operating temperature (discharge): -20°C to +65°C
• Operating temperature (charge): 0°C to +45°C
• Self-discharge: approx. 15–20% per month

Why choose it

This cell offers a stable 1.2 V output with minimal memory effect, ensuring consistent performance over hundreds of cycles. The solder pins provide secure mechanical and electrical connection, eliminating the need for separate holders in compact designs. VARTA's proven quality in button cells means you can trust it for critical applications.

Ideal use cases

• Memory backup for real-time clocks and SRAM
• Portable medical devices such as glucose meters and hearing aids
• Industrial sensors and IoT endpoints
• Handheld instruments and remote controls

Good to know

For best results, charge at 4 mA for 14–16 hours. Avoid deep discharge below 1.0 V to prolong cycle life. Store in a cool, dry place; self-discharge is higher at elevated temperatures. This cell is RoHS compliant and suitable for automated soldering processes.