Axion XQ38, Manual

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Recommendations for Use
The batteries should be partially charged (50 to 80 %) for long-term storage.
Charge at an ambient temperature of 0°C to +35°C (32°F to 95°F) or the lifespan of the
battery will decrease significantly.
Using the battery at sub 0°C (<32°F) ambient temperature decreases battery capacity.
This is normal and not a defect.
Using the battery at temperatures outside the range of -25°C to +40°C (-13°F to 104°F)
may reduce battery life.
The battery is short-circuit protected. Any situation that may cause short-circuiting should
be avoided.