Rechargeable Button Cell Battery Varta V2/40H-SLF++/- 40H NiMH 43 mAh 2.4 V

Varta V2/40H-SLF++/- 40H is a rechargeable NiMH button cell battery with a nominal voltage of 2.4 V and a capacity of 43 mAh. It is designed for compact, low-drain electronic devices where a small rechargeable energy source is required. The cell provides stable voltage during discharge and supports multiple recharge cycles, making it suitable for instruments that need reliable, repeatable power while keeping device size to a minimum.

Advantages

The rechargeable NiMH chemistry delivers consistent voltage and a reasonable cycle life for small-format cells, reducing waste compared with single-use alternatives. Its compact button form factor allows integration into tight spaces and lightweight assemblies. The battery's construction is intended to provide low self-discharge and stable output under typical low-current loads, ensuring predictable performance in small sensors, watches, and medical devices.

Suitable for

• Compact sensors and transmitters with low continuous current draw
• Medical monitoring devices and portable diagnostic tools
• Watches and timekeeping accessories designed for rechargeables
• Small consumer electronics such as remote controls, toys, or LED indicators

Key specifications

• Chemistry: Nickel–Metal Hydride (NiMH)
• Nominal voltage: 2.4 V
• Typical capacity: 43 mAh
• Cell type: button cell (small cylindrical/flat format)
• Intended use: low-drain, compact electronic devices

How to use

Install the cell with correct polarity in the device battery compartment or holder, ensuring firm contact with terminals. Use an appropriate charger or charging circuit designed for NiMH button cells and follow recommended charging currents and termination methods for small-capacity cells. Avoid charging at excessively high currents and do not attempt to charge if the cell is physically damaged or shows signs of leakage. For long-term storage, store cells in a cool, dry place and charge to a partial state of charge if required by the device manufacturer's guidance.

Recommendations

Use a charger specifically specified for NiMH button cells or the device's integrated charging electronics to maintain safety and cell life. Periodically check device performance and recharge before the voltage falls below the manufacturer's recommended minimum to avoid device resets or data loss. Dispose of or recycle cells according to local regulations for rechargeable batteries.