Nikon recommends charging the Nikon D3500 battery indoors at ambient temperatures of 5 °C–35 °C (41 °F–95 °F). And they warn that the battery will not charge if its temperature is below 0 °C (32 °F) or above 60 °C (140 °F). They also recommend NOT using the battery in ambient temperatures below 0 °C (32 °F) or above 40 °C (104 °F). In many parts of the world, that can be impractical outdoors. But the reason they make this recommendation is that lithium-ion batteries don't perform well in very cold or very warm temperatures.