Rechargeable NiMH Button Cell Varta V40H 1.2V 40mAh, model 55604101501

Varta V40H is a rechargeable NiMH button cell with a nominal voltage of 1.2 V and a rated capacity of 40 mAh. The cell is intended for compact, replaceable power in small electronic devices where low continuous or intermittent current draw is required. As a rechargeable alternative to disposable button cells, this cell enables repeated recharge cycles and reduces battery waste while maintaining stable voltage for timekeeping and sensing applications.

Advantages

The NiMH chemistry provides a stable 1.2 V output suitable for devices designed for rechargeable cells. The 40 mAh capacity balances size and run time for low-drain electronics. Rechargeability reduces ongoing cost and environmental impact compared with single-use alkaline or silver-oxide cells. The compact button format is compatible with devices that accept standard button-style rechargeable cells and allows straightforward replacement.

Suitable for

• Wristwatches and timekeeping devices that accept 1.2 V rechargeable cells
• Key fobs and security transmitters with low power consumption
• Small sensors, remote controls, and wireless tags
• Backup memory modules and small firmware-powered modules in consumer electronics

Key specifications

• Chemistry: Nickel‑Metal Hydride (NiMH)
• Nominal voltage: 1.2 V
• Rated capacity: 40 mAh
• Format: button cell (small, round rechargeable cell)
• Intended usage: low-drain applications, intermittent discharge cycles

How to use

Install the rechargeable button cell in the device following the manufacturer’s polarity markings and insertion method. Charge the cell using a charger that supports small NiMH button cells or a compatible NiMH charger profile; follow the charger manufacturer’s instructions for correct charging current and termination method. Observe recommended charge and discharge limits for the device, and replace the cell when capacity degrades noticeably or runtime becomes insufficient for the device’s needs.

Recommendations

Use an appropriate NiMH-compatible charger and avoid charging in devices that do not provide correct charge control. Store unused cells at moderate temperature and partial state of charge to prolong shelf life. Recycle the cell according to local battery disposal regulations when it reaches end of life.