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The nominal voltage of a battery isn't the maximum voltage, 3.7V lithium cells are typically charged to around 4.2V. A 4S battery (or equivalent) will have a n
by thehobgoblin 7y ago
The nominal voltage of a battery isn't the maximum voltage, 3.7V lithium cells are typically charged to around 4.2V.
A 4S battery (or equivalent) will have a nominal voltage of 14.8V and a maximum voltage of 16.8V, which leaves 2.2V extra, probably to account for losses.
Why 19V ended up being the typical voltage rather than rounding it up to something like 20V or 24V is beyond me (probably a matter of compliance, try checking IEC 60950-1 or related standards).
- cesarb 7y agoI have seen many laptops where the charger sticker says the output voltage is 19.5V. And the nearest USB-C standard voltage is 20V, so that's probably what most newer laptops which charge through a USB-C socket use.