Các tế bào connetion P9

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Các tế bào connetion P9

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OPTIONS AND ACCESSORIES Cellular telephones have so many features built into them that it’s difficult to think of anything more that could be added to them. Many of these features have been discussed in previous chapters, but we will explore them further here. BATTERIES A second battery is perhaps the most-requested accessory of any portable cellphone user. It extends the time between charges while on the road, and ensures that there is always a charged battery at hand if you find that the battery in your phone is dead. Since the standard battery is usually a nickel—cadmium (NiCad) battery, users often will...

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