The reason is that USB ports on computers are designed to meet the original USB 2 specifications, which allow a maximum of 500mA for any device and have no provision for charging or high power.My conclusion is that the Computer power supply is so well regulated (at 5 V) as to really not be suitable for "charging" purposes.
The reason is that USB ports on computers are designed to meet the original USB 2 specifications
Once upon a time that was true, however today we have inverters, so I can plug a battery into a USB outlet and the battery will charge from it, I then take it out with me and when my phone goes flat plug the phone into the battery which recharges my phone. Clearly to work some where along the line an inverter raises the voltage.The only way in which one can "charge" a battery (of cells) is to provide a voltage higher than the output of the cells and a relatively low resistance charging path to the cells concerned, which will then force current to produce a chemical change within the cells concerned.
Considering the very small current involved in this process when charging any "5 volt" Smart Phone battery of cells, the prime consideration must be the voltage of the charging supply.
(The resistance of any conceivable "Wire" concerned must be negligible.)
Well I just pop the cable in at night when I go to bed and also find it fully charged in the morning - no faffing about Not to mention, "standard" chargers and cables are so cheap that it's easy to have a few around the house.The are a godsend!, just pop the phone on the pad when you go to bed and fully charged by morning, no faffing about.
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