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A USB killer is a device that is designed to be portable and sends high-voltage power surges repeatedly into the data lines of the device it is connected to, which will damage hardware components on unprotected devices.
The charging device identifies a charging port by non-data signaling on the D+ and D− terminals. A dedicated charging port places a resistance not exceeding 200 Ω across the D+ and D− terminals. [51]: §1.4.7; table 5-3 Per the base specification, any device attached to a standard downstream port (SDP) must initially be a low-power device ...
MagSafe was introduced on 10 January 2006, in conjunction with the MacBook Pro, the first Intel-based Mac laptop, at the Macworld Expo. A MagSafe connector is held in place magnetically so that if it is tugged (for example, by someone tripping over the cable), it will be pulled out of the port without damaging the connector or the port, and ...
Some cheap cables identified lack pull-up resistors mandated by the USB specification, potentially causing devices to draw high levels of current, causing irreversible damage to the machines they are plugged into. [4] Leung found problematic cables can break the USB port they are plugged into, or even risk causing an electrical fire. [5]
A properly designed charger can allow batteries to reach their full cycle life. Excess charging current, lengthy overcharging, or cell reversal in a multiple cell pack cause damage to cells and limit the life expectancy of a battery. Most modern cell phones, laptop and tablet computers, and most electric vehicles use lithium-ion batteries. [27]
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