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  3. Milliamp-hours per hour

Milliamp-hours per hour

Scheduled Pinned Locked Moved Lemmy Shitpost
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    wrote last edited by [email protected]
    #16

    mA / h / h => mAh / h^2^

    That's one hell of a measurement unit.

    Edith: apparently I'm an idiot

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    • hoshikarakitaridia@lemmy.worldH [email protected]

      mA / h / h => mAh / h^2^

      That's one hell of a measurement unit.

      Edith: apparently I'm an idiot

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      wrote last edited by
      #17

      mAh ≠ mA/h

      hoshikarakitaridia@lemmy.worldH 1 Reply Last reply
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      • D [email protected]
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        wrote last edited by [email protected]
        #18

        So this is 510 mA per hour, I guess. That or it just draws 510 mA continuously

        C N naich@lemmings.worldN 3 Replies Last reply
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          wrote last edited by
          #19

          How many MPG per gallon does it get per mile, though?

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          • tropicaldingdong@lemmy.worldT [email protected]

            Furlongs per fortnight.

            And an IRL one I encountered, and some one straight facedly expected me to do scientific research in this unit: The Miner's Inch.

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            wrote last edited by
            #20

            Furlongs per fortnite, but its talking about the file size of the uncompiled source code of the current version.

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            • L [email protected]

              “Honey, can you come down to the bank? I need you to put in your PIN number at the ATM machine, as ASAP as possible!”

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              wrote last edited by
              #21

              No, there's no "per" in mAh.

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              • T [email protected]

                So this is 510 mA per hour, I guess. That or it just draws 510 mA continuously

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                wrote last edited by
                #22

                Not really, it makes sense to give a max current. If a car's top speed is listed as 200 km per hour, it does not mean that it goes this fast continuously.

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                • C [email protected]

                  Not really, it makes sense to give a max current. If a car's top speed is listed as 200 km per hour, it does not mean that it goes this fast continuously.

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                  wrote last edited by
                  #23

                  I get this is a battery but the units don’t make sense unless it’s going at 100% all the time

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                  • T [email protected]

                    So this is 510 mA per hour, I guess. That or it just draws 510 mA continuously

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                    wrote last edited by [email protected]
                    #24

                    The battery has the storage capacity to pass 510 mA in an hour. If you discharge at half the capacity of 255 mAh (0.5C) it will be empty after 2 hours.

                    If it was to draw 51 mAh (0.1C) it would last 10 hours.

                    But if it would draw 1020 mAh (2C) it would only last 30 minutes

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                    • C [email protected]

                      No, there's no "per" in mAh.

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                      wrote last edited by
                      #25

                      Of course there is, miliAmp per(e) hour,duh.

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                      • T [email protected]

                        I get this is a battery but the units don’t make sense unless it’s going at 100% all the time

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                        wrote last edited by
                        #26

                        Really? I have a camera that is rated "3.7 V, 2 A" but only draws that amount from the battery when the flash capacitor is recharging. Yes, the normal current draw would be more helpful, and in case of a watch, the standby current.

                        This may be the charging current but it would be pretty unusual to pick a value slightly above what legacy USB can deliver (500 mA).

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                        • O [email protected]

                          Of course there is, miliAmp per(e) hour,duh.

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                          wrote last edited by
                          #27

                          You got me there. Congrats.

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                          • T [email protected]

                            So this is 510 mA per hour, I guess. That or it just draws 510 mA continuously

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                            wrote last edited by
                            #28

                            510mA per hour is nonsensical because A is an instantaneous measurement. 510 mAh/h is 510 mA. I guess you need a backpack to carry the battery around if you want the watch to last all day.

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                              wrote last edited by
                              #29

                              Wouldnt that just translate back to it drawing 510ma of current? If you use 510mah in an hour that means you are drawing 510ma of current. That also means for all day battery life you would need a 8000mah battery at least which would make quite the chunky watch lol.

                              F mangopenguin@lemmy.blahaj.zoneM 2 Replies Last reply
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                              • S [email protected]

                                No, the safeword is "0.002 cents"

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                                wrote last edited by
                                #30

                                That's the safe safeword.

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                                • R [email protected]

                                  mAh ≠ mA/h

                                  hoshikarakitaridia@lemmy.worldH This user is from outside of this forum
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                                  wrote last edited by
                                  #31

                                  So it would be

                                  mAh / h => mA

                                  Then?

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                                  • A [email protected]

                                    Wouldnt that just translate back to it drawing 510ma of current? If you use 510mah in an hour that means you are drawing 510ma of current. That also means for all day battery life you would need a 8000mah battery at least which would make quite the chunky watch lol.

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                                    wrote last edited by
                                    #32

                                    Yeah, this seems like a metric specifically chosen s.t. it makes intuitive sense to the average person AND it has a nice physical interpretation. Similar to how EU efficiency labels show power draw in W as kWh per 1000h of use

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                                    • C [email protected]

                                      Really? I have a camera that is rated "3.7 V, 2 A" but only draws that amount from the battery when the flash capacitor is recharging. Yes, the normal current draw would be more helpful, and in case of a watch, the standby current.

                                      This may be the charging current but it would be pretty unusual to pick a value slightly above what legacy USB can deliver (500 mA).

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                                      wrote last edited by
                                      #33

                                      The max rating is important so your powersupply/battery can be sized accordingly. No powersupply can provide a abitrary current at their rated voltage.

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                                      • N [email protected]

                                        The battery has the storage capacity to pass 510 mA in an hour. If you discharge at half the capacity of 255 mAh (0.5C) it will be empty after 2 hours.

                                        If it was to draw 51 mAh (0.1C) it would last 10 hours.

                                        But if it would draw 1020 mAh (2C) it would only last 30 minutes

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                                        wrote last edited by
                                        #34

                                        This is the winning response I think.

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                                        • F [email protected]

                                          Yeah, this seems like a metric specifically chosen s.t. it makes intuitive sense to the average person AND it has a nice physical interpretation. Similar to how EU efficiency labels show power draw in W as kWh per 1000h of use

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                                          wrote last edited by
                                          #35

                                          Similar to how EU efficiency labels show power draw in W as kWh per 1000h of use

                                          That sounds nice for appliances that run intermittently like refrigerators

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