![]() ![]() ![]() To charge a 4.2 V cell at least slightly more voltage is required to provide some “headroom” to allow charge control electronics to function. Each battery consists of at least a number of LiIon cells in a series 'string' and may consist of a number of parallel combinations of several series strings.Ī Lithium Ion cell has a maximum charging voltage of 4.2 V (4.3 V for the brave and foolhardy). Voltages slightly below 19 V can be used but 19 V is a useful standard voltage that will meet most eventualities.Īlmost all modern laptops use Lithium Ion (LiIon) batteries. ![]() Various combinations of series and parallel cells can be accommodated. The voltage is slightly more than a multiple of the fully charged voltage of a Lithium Ion battery-the type used in almost every modern laptop.ġ9 V provides a voltage which is suitable for use for charging up to 4 x Lithium Ion cells in series using a buck converter to drop the excess voltage efficiently. ![]() This is not a design question as posed, but it has relevance to design of battery charging systems. That isn't a multiple of anything suitable. Now there're laptops that use external power supplies rated at exactly 19 volts. ![]()
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