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2019-05-18 11:22 71009350 Anonymous (nokia-3310-mobiltelefon-blaa.jpg 400x400 15kB)
Will my phone die if I supply it with 4V USB power instead of 5V?

12 min later 71009499 Anonymous
It would be extremely painful

15 min later 71009520 Anonymous
>>71009350 The worst that could possibly happen is that it fails to charge its battery or otherwise work properly until you give it something closer to the correct voltage.

16 min later 71009527 Anonymous
>>71009350 short answer: no long answer: yes

19 min later 71009573 Anonymous
If the phone is up to spec then it refuses to charge

1 hours later 71010358 Anonymous
>>71009350 the battery in the phone is most likely 3.7V. the charging voltage is somewhere between 3.7V and 4.4V. the charging circuit probably takes somewhat between 4.7V and 5.3V. as long as you stay within that range you should be fine, though it runs most efficient on 5V. going lower should simply make it not charge, but there might be some bad surprises down the road.

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