Post AcSYnurlGGtoikmo1Q by cvtsi2sd@hachyderm.io
(DIR) More posts by cvtsi2sd@hachyderm.io
(DIR) Post #AcSIFnwgt2Xu92nvfs by Steveg58@aus.social
2023-12-04T04:53:32Z
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@mike 5 x 3.7 = 18.5?Common voltage regulators used to max volt in the 20-30 volt range so it could be related to parts ratings.Some countries legislate that the maximum voltage allowed where a consumer might contact it is somewhere around 30Volts. I could be to duck under some regulatory requirement for some major market.
(DIR) Post #AcSIFow1D1bPDFUuGW by daniel@campduffel.social
2023-12-04T04:59:02Z
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@Steveg58 @mike Yeah, I think it has to do with with a multiple of an 18650 cell.
(DIR) Post #AcSYnurlGGtoikmo1Q by cvtsi2sd@hachyderm.io
2023-12-04T08:04:28Z
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@daniel @Steveg58 @mike I'm not really sure it has much to do with batteries, looking at https://www.thinkwiki.org/wiki/Power_Connector#barrel_connector.2C_slim (and around) and correlating it with https://www.thinkwiki.org/wiki/Batteries#Nicd I see many NiCd/NiMh models with 19/20 V adapters.
(DIR) Post #AccJjYkisJyfqXnak4 by dalias@hachyderm.io
2023-12-04T12:12:33Z
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@mike Wow, there are,a bunch of wrong answers here. I don't know what the right one is, but the basic constraint is using high enough voltage to deliver the needed watts without exceeding current limits of wires or connectors. Laptops seem tolerant of a range of voltages from aftermarket supplies so I really doubt the specific number 19 is special for battery cell configuration. I've seen laptops all around range 16-20, too.
(DIR) Post #AccJja4bxrTrwW6zNg by lanodan@queer.hacktivis.me
2023-12-09T01:02:06.154217Z
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@dalias @mike I've seen as low as 14V for 2003~2006 laptops, meaning you could directly plug your laptop in a running car with no transformers.btw my pre-USB-C universal laptop power supply (Kensington K38074) has two modes: 14V-17V and 17V-21V so that confirms the voltage tolerance.