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Alex, an adventure photographer, reached a remote ridgeline after a four-hour hike, ready to launch his drone at golden hour. When he grabbed his BLUETTI Handsfree 2, the unit was dead not because of failure, but because it had been stored fully charged in a hot car for weeks. Heat + high voltage had quietly degraded the LiFePO4 cells before he even pressed the power button. This scenario highlights the single biggest truth about off-grid gear: battery longevity depends far more on user habits t …