Both high and low temperatures can affect battery performance and overall life.
High temperatures can cause a decrease in downhole battery capacity. The battery can provide less usable energy. Low temperatures also reduce battery capacity, especially in primary batteries.
Elevated temperatures increase the self-discharge rate of downhole batteries. This can lead to faster energy depletion and shorter shelf life.
Extreme temperatures, especially prolonged exposure to high temperatures, can reduce the overall cycle life of a battery, resulting in a shorter service life.