At present, the cellular telephones have become, for more and more usuary, in an inseparable companion related to photographies, music, video, connections with dear beings and/or businesses, of which it is difficult to be separated, sometimes it seemed an umbilical cord to the globalised world, nevertheless, the batteries have not advanced to the same step that has made it the number of applications and the dependency degree that we kept towards these movable devices of interaction, reason why turns out useful to pay attention to the best practices for the efficient use of the portable energy storage. Concerning to maintain the life of the batteries working by more time, there are two separated aspects that are related to each other worthy of consideration, as to extend the time it enters loads and like prolonging the total life of the battery. In the present market, there are 3 types of technologies for batteries of cellular telephones, these are: Lithium-ion, Nickel-Metal Hydride (NiMH) and Nickel-Cadmium (NiCD). The batteries with technology Lithium-ion is recommended for their use in cellular telephony for being lighter and to have mejo performance compared to other types. They are lighter 30% and they have a performance 20% generally better than a battery of NiMH type of a similar classification mAh (mAh is an abbreviation for mili-ampere hours, which represent units of electrical charge, in the case of batteries of similar voltage a greater value of mAh indicates that the battery has one better lifting capacity and that it will allow operation of the equipment by a greater time before needing to recharge itself) Another important advantage of the batteries Li-ion is that they are not susceptible to present/display Effect Memory which reduces the lifting capacity of a battery and will be discussed more ahead. Acondicionar is advisable a new Li-ion battery during the first 3 cycles of load, for this the battery in load way is due to leave during all night and to use it until it unloads completely, is important to mention that they can be damaged if they overload persistently, for example leaving connected it by more than 24 hours.