In general, nickel hydride batteries are known for their resistance to cold temperatures compared to other rechargeable batteries. They can withstand temperatures ranging from -4°F to 140°F (-20°C to 60°C) without significant damage.
Nickel-metal hydride (NiMH) batteries can function in cold weather, but their performance does typically degrade in colder conditions, especially at temperatures below freezing point (0°C or 32°F). The chemical reactions that generate electricity in the battery are slowed by the cold, resulting in reduced capacity and power output.
However, NiMH batteries are generally more resistant to cold than other types of batteries, such as lithium-ion. So while the performance might be reduced, they can still operate. To maximize performance in cold weather, it can be helpful to keep the batteries warm until they are needed and to use a battery warmer if one is available.It is recommended to store and use nickel hydride batteries in temperatures between 32°F and 95°F (0°C and 35°C) for optimal performance and longevity.