So, I don’t have the proper equipment to measure this so I hope I can get an official or unofficial answer. How much power exactly does the laptop require? In terms of voltage and amps specifically? Because I’ve had issues charging it with a lot of “generic” USB-C chargers that are either under 45W power or that they don’t output the proper voltage. I even tried the official Raspberry charger.
I assume there is some negotiation happening and I can guess that the input voltage is maybe 9V? Since it needs to both charge the cells and to power the board, so obviously 5V would be under the threshold. It would be smart to put this information on the Wiki as well, since people might assume a wrong device (i.e. official Raspi charger).
I have an “ISY” brand of 65W that works but that one has 5 different voltages, and I’ve already read that some folk couldn’t get it to work with 45W or 65W versions (I assume GaN only, maybe?).
In my experience (both using powerbanks that feature a display - I have a Baseus Adaman 20Ah; and small USB-C tester gizmos to measure charging) the One Up asks as high a voltage it can (e.g.: 20V at 2A).
It has also trouble negociating charging with some specific chargers (It can’t manage to negociate with my older Baseus Gan3 100W, but work with all the other different Baseus I own?! (including a more recent GaN6 100W) Their own power bank I linked above also has trouble charging from that one, so I would blame sub-optimal implementation of negociation)
In general in normal operation, it would need at least 45W (works with my Valve SteamDeck’s original 45W power brick, and with everything larger than that minus the negociation troubles mentionned above with one specific 100W and with one Apple charger)
If the laptop is shut off or if the battery is already charged or close to charged (and thus doesn’t pull too much current charging), it seems to be also able to work with ~30W (the Raspberry Pi 5’s original 27W power brick, and a Baseus 30W wall wart). If the battery is empty (and thus needs more amps), the charging cycles on and off constantly (I presume the laptop trips the charge by trying to pull more Amps than negociated?)
Jeff Geerling’s thread at GitHub also mentions his own experience, it roughly matches mine. (He didn’t try the RasPi5 27W on an empty battery, I presume).
In general, the whole device is closer to a regular laptop and charge at higher voltage and requires some watts, than older Arm devices (such as the PineBook Pro which charged exclusively at 5V, max 2.5A on the USB-C port, max 3A on the barrel)
On: This might also depend on the power drain of the NVMe if you have one in.
I had an old Intel 6000p laying around that I plugged in. This one draws 10W under load on its own.
Off: Weird, it worked on my case. Maybe slightly variations in production that just so push it above or below the limits?