Printed mAh reflects cell capacity at 3.7V, not the 5V you charge with. After conversion and efficiency losses, usable output often drops thirty percent. Compare weight-to-capacity; underweight banks may hide tiny cells. Two ports help, but simultaneous output can slash speed. Choose models that publish efficiency ranges and provide temperature readouts or auto-cutoff, protecting phones during tight backpack spaces where heat silently accumulates around electronics.
Cable deaths begin at the neck. Look for long, flexible strain relief, double-braided jackets, and molded housings without sharp steps. Independent bend-cycle ratings above 10,000 promise better survival. Shorter lengths tangle less; ninety-degree plugs reduce pocket stress. Label both ends so midnight rides do not force guesswork. Store with a soft loop instead of a tight knot—your budget cable will feel premium far longer.






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