Cellphones of the past came equipped with rechargeable nickel-based batteries with (Ni-Cd and NiMH). In the past few years, however, most rechargeable batteries used in phones are Lithium-based. They are either Lithium-ion (Li-Ion) and Lithium Polymer (Li-Po). The fundamental difference between a polymer lithium-ion battery and a liquid lithium-ion battery is that the electrolytes used in the two are different. Lithium-ion batteries have high energy density, so they hold more charge per volume but lose charge with aging even when not used. Li-Polymer has a lower energy density battery, but they are thinner, lighter, safer, and retain charge better as their age. Lithium polymer batteries are more advanced and significantly more expensive than Lithium-ion to manufacture so neither is definitively better than the other. Manufactures usually decide which type of battery is better suited for the the particular device design. The circuitry to recharge the batteries in a portable product such a mobile phone plays an important part in determining the battery longevity and the practicalities of using the product on a daily basis. The charging protocol (how much voltage or current for how long, and what to do when charging is complete) depends on the size and type of the battery being charged. The modern battery chargers adapt the charging parameters dynamically based on the level of charging the battery has reached. An empty battery can be charged faster without any safety risk. This is why most benchmarks for charging speed (ours included) quote the battery charging level reached after a 30-minute charging session on an empty battery. With basic chargers outputting 5V/1A equalling to 5W of power, anything faster than that is considered quick or fast charging. Wi-Fi is a WLAN (Wireless Local Area Network) technology. It provides short-range wireless high-speed data connections between mobile data devices (such as laptops, PDAs or phones) and nearby Wi-Fi access p
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