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1. Embed this notice
   clacke (clacke@libranet.de)'s status on Monday, 13-May-2024 21:38:04 JST clacke

   A 10 000 mAh powerbank fully charged contains 2 nanograms of electric potential.

   e = mc²

   10 Ah * 5 V = 50 Wh
   50 Wh * 3600 s/h = 180 000 J

   180 000 J / (300 000 000 m/s)² = 2*10⁻¹² kg

   • Embed this notice
     clacke (clacke@libranet.de)'s status on Monday, 13-May-2024 21:38:02 JST clacke

     in reply to
     10 Ah * 5 V = 50 Wh

     
     Is that how the mAh rating on powerbanks works, or is the A meant to be at the internal voltage like 7.2 V or something?

     Why do they even use Ah? Use Wh instead and avoid this confusion.

     (the world is not ready for powerbanks rated in J)

   • Embed this notice
     Alfred M. Szmidt (amszmidt@mastodon.social)'s status on Monday, 13-May-2024 22:06:54 JST Alfred M. Szmidt

     in reply to

     @clacke The two have vastly different purposes and meaning (Ah being how long you can abuse the battery for, which Wh does not convey), plus bunch of standards mandate it AFAIR.

   • Embed this notice
     clacke (clacke@libranet.de)'s status on Monday, 13-May-2024 22:06:54 JST clacke

     in reply to

     • Alfred M. Szmidt

     > vastly different purposes

     why

     > standards mandate it

     why 🤣

     @amszmidt

   • Embed this notice
     Alfred M. Szmidt (amszmidt@mastodon.social)'s status on Monday, 13-May-2024 22:48:58 JST Alfred M. Szmidt

     in reply to

     @clacke standards aren’t fun. They are dead serious.

   • Embed this notice
     clacke (clacke@libranet.de)'s status on Monday, 13-May-2024 22:48:58 JST clacke

     in reply to

     • Alfred M. Szmidt
     @amszmidt Serious things are too important to take seriously.
   • Embed this notice
     Alfred M. Szmidt (amszmidt@mastodon.social)'s status on Monday, 13-May-2024 22:49:00 JST Alfred M. Szmidt

     in reply to

     @clacke I explained why for the first, and the second see the first. If you cannot figure out what the difference is between Wh and Ah ..

   • Embed this notice
     clacke (clacke@libranet.de)'s status on Monday, 13-May-2024 22:49:00 JST clacke

     in reply to

     • Alfred M. Szmidt
     @amszmidt You stated that they are used for different things. I get that that may be the case, but that's not the why of anything (EDIT: except the very immediate and superficial "why rate it in Ah", of course). There's no need to talk down to each other, I thought we were having fun.
   • Embed this notice
     AN/CRM-114 (flyingsaceur@ioc.exchange)'s status on Monday, 13-May-2024 23:59:36 JST AN/CRM-114

     in reply to

     @clacke Tired: measuring battery capacity in hours of operation
     Wired: measuring battery capacity in kilowatt-hours
     Ad astra per aspired: measuring battery capacity in equivalent antimatter mass

     An 80 kWh battery is a 1.6 nanogram battery

     clacke likes this.