I have a bank of SOK batteries and a bank of Lion Energy batteries. In cold weather (20 degrees F) my SOK batteries read 12 V until I bring them in and warm them, then they read 13:5 volts. My Lion Energy batteries show 13.5 V hot or cold. Any ideas as to why? I have disconnected the charging circuit because I'm aware that they can be damaged if charged in cold weather.
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The behavior you described with your SOK and Lion Energy batteries in cold weather can be attributed to the characteristics and performance differences between the battery chemistries used in the two brands. Run 3