This approach online professional explanation is this: cell phone battery charging and discharging process is a process, in the meantime, the battery charge within the yin and yang with each other to pay the charge hit. The reason why the battery will be increasingly without the use, because in the normal room temperature, the electron kinetic energy within the relatively large, thus the battery is in an active state, leakage situation is relatively frequent. But will the battery into the low-temperature environment, the surface of the lithium battery electrolyte membrane and the micro-structure, as well as their interfaces are changed significantly, leading to cell within the temporarily active, to reduce leakage current, so re-charged, mobile phones to be power-up time will increase.
For this interpretation, I am not a physics do not know in the end right wrong with that.
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The second argument, using an eraser wipe mobile phone batteries and cell phone contact with the metal contact surface that allows the use of mobile phone batteries situation is much good.
This principle is still relatively easy to understand will be a long time the metal surface oxidation, a natural touch to almost the battery also used for short time. I use my Samsung mobile phone batteries to do experiments, do not use an eraser, and We find a polishing sandpaper, folded in two, using the sharp points to mobile phone battery polished brass touch of a few films, and then clean cloth wipe over again to fully discharge and then charge the battery than the original multi-purpose piece of the day, it seems there are still effects.