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A lithium-ion or Li-ion battery is a type of rechargeable battery that uses the reversible intercalation of Li + ions into electronically conducting solids to store energy. In comparison with other commercial rechargeable batteries, Li-ion batteries are characterized by higher specific energy, higher energy density, higher energy efficiency, a longer cycle life, and a longer calendar life.
The iPad (4th generation) [15] (marketed as iPad with Retina display, [16] colloquially referred to as the iPad 4) [17] [18] is a tablet computer developed and marketed by Apple Inc. Compared to its predecessor, the third-generation iPad, the fourth-generation iPad maintained the Retina Display but featured new and upgraded components such as the Apple A6X chip and the Lightning connector ...
Experimentation with lithium batteries began in 1912 under American physical chemist Gilbert N. Lewis, but commercial lithium batteries did not come to market until the 1970s in the form of the lithium-ion battery. [29] [30] Three volt lithium primary cells such as the CR123A type and three volt button cells are still widely used, especially in ...
The iPad (6th generation) [4] (also referred to as the iPad 9.7-inch [5]) is a tablet computer developed and marketed by Apple Inc. It was announced on March 27, 2018, during an education-focused event at Lane Tech High School in Chicago [6] and is the successor to the fifth-generation iPad, upgraded with the Apple A10 Fusion processor and support for styluses such as Apple Pencil. [7]
The iPad 2 is a tablet developed and marketed by Apple Inc. Compared to the first iPad, as the second model in the iPad line, it gained a faster dual core A5 processor, a lighter build structure with a flat, rather than curved, back, and was the first iPad to feature VGA front-facing and 720p rear-facing cameras designed for FaceTime video calling.
Introduced 1898 as the first flashlight battery. Can be replaced with an AA cell or a C cell using a plastic sabot (size adaptor), with proportional loss of capacity. F: R25 (carbon‑zinc) LR25 (alkaline) 60: 10,500 (carbon‑zinc) 26,000 (alkaline) 1.5: 33 × 91 Four F cells are often found within 6-volt rectangular lantern batteries. N: Lady ...
The lower portion of the iPad, showing the charging port and audio output grilles The Apple A4 chip, used in the first-generation iPad and the iPhone 4. The first-generation iPad features an Apple A4 SoC, [3] which comprises a 1 GHz processor, 256 MB of RAM and a PowerVR SGX535 GPU.
The iPad Mini (branded and marketed as iPad mini) is a line of small tablet computers developed and marketed by Apple Inc. It is a sub-series of the iPad line of tablets, with screen sizes of 7.9 inches and 8.3 inches. The first-generation iPad Mini was announced on October 23, 2012, and was released on November 2, 2012, in nearly all of Apple ...