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Modern (Lithium ion and Metal Nickel Hydride) cell phone batteries have no "memory" problems like those that plagued Nickel Cadmium accumulators so you do not have to let the battery discharge fully before recharging them. However some modern battery chemistry does improve during the first few charge cycles so the full usefull duration is attained only after some (say 5) charge/uncharge cycles.

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Q: Does battery life increase by letting your new cell phone battery run out before the first full charge?
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