Rechargeable Button Cell Battery Varta V40H-SLF 43 mAh 1.2 V NiMH

Varta V40H-SLF is a rechargeable NiMH button cell battery with a nominal capacity of 43 mAh and a nominal voltage of 1.2 V. It is designed to provide compact, reusable power for small electronic devices that require stable low-voltage supply. The battery format and chemistry make it suitable for applications where occasional recharging and long-term reliability are important, while avoiding the waste of disposable cells.

Advantages

The cell delivers consistent voltage under light to moderate load, supports multiple charge/discharge cycles, and offers predictable performance across repeated recharges. Its NiMH chemistry provides lower self-discharge than older rechargeable chemistries and compatibility with standard NiMH charging systems designed for button cells. The compact form factor allows direct replacement in devices designed for similarly sized rechargeable button cells.

Suitable for

• Watches and wearable timepieces that accept a 1.2 V rechargeable button cell
• Calculators and small desktop electronics
• Memory backup in electronic modules and small instruments
• Low-drain sensors, remote controls, and measurement devices

Key specifications

• Chemistry: Nickel–metal hydride (NiMH)
• Nominal voltage: 1.2 V
• Nominal capacity: 43 mAh
• Cell type: Rechargeable button cell
• Typical applications: Low-drain, compact electronic devices

How to use

Install the battery in devices following the polarity markings and the device manufacturer's instructions. Use a charger compatible with NiMH rechargeable button cells and observe the recommended charging current and time to avoid overcharging. Allow the cell to cool to ambient temperature before charging if it has been in prolonged operation. Replace the battery if capacity noticeably decreases or if the device displays memory loss or unstable operation.

Usage recommendations

Store unused cells in a cool, dry place and avoid prolonged exposure to high temperatures. For long-term storage, charge the cell partially according to NiMH storage guidance and check charge state periodically. When replacing disposable cells with this rechargeable option, confirm device compatibility with a 1.2 V supply and with the cell's dimensions.