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These days it is rare for a phone to be able to be used without a battery. The reason is that the max energy consumption when the CPU and GPU are running 100% e

by kccqzy 11mo ago

These days it is rare for a phone to be able to be used without a battery. The reason is that the max energy consumption when the CPU and GPU are running 100% exceeds the wattage that the device can accept over USB PD.

e44858 11mo ago
I've had success using a large capacitor instead of the battery. To keep it charged I connected its positive leg to the 5v USB pin through a diode.
vlovich123 11mo ago
Unlikely a web server would see such usage patterns.
jofzar 11mo ago
That can't be true right? PD (and some Chinese standards) have insane wattage allocation/allowances, there's no way that a mobile CPU can pull over that amount, it's more that they don't support it.
- fragmede 11mo ago
  > device can accept over USB PD Accept, not what the power supply can supply. Cell phones aren't being made with massive laptop-sized 100W accepting circuitry.
  - jofzar 11mo ago
    > Accept, not what the power supply can supply. Cell phones aren't being made with massive 100W accepting circuitry. Surprisingly they are, supervooc goes up to 120w now (which is insane), there is also a Motorola phone which also does 68w via PD standard https://m.gsmarena.com/oneplus_15-review-2898p3.php https://m.gsmarena.com/oneplus_15-review-2898p3.php https://www.gsmarena.com/motorola_moto_g_stylus_5g_(2025)-13784.php https://www.gsmarena.com/motorola_moto_g_stylus_5g_(2025)-13... As for past through charging, it's actually apparently more common then I knew. Google does it as part of their "adaptive" charging (hits 80% then does pass through) and the OnePlus etc also do it with a settings for gaming. (Older article confirming this https://www.androidauthority.com/phones-with-bypass-charging-support-3509066/ https://www.androidauthority.com/phones-with-bypass-charging...)
whitehexagon 11mo ago
I was pleased to discover my old PinePhone allows this. It makes development much easier when having to swap the SD card every few minutes, and allows for simple power cycle via USB switch. What I cant figure out is how to detect power usage from the PMIC when in that configuration. ie seems to still assume power draw happens via a battery.

by kccqzy 11mo ago

e44858 11mo ago

I've had success using a large capacitor instead of the battery. To keep it charged I connected its positive leg to the 5v USB pin through a diode.

vlovich123 11mo ago

Unlikely a web server would see such usage patterns.

jofzar 11mo ago

That can't be true right? PD (and some Chinese standards) have insane wattage allocation/allowances, there's no way that a mobile CPU can pull over that amount, it's more that they don't support it.

fragmede 11mo ago
> device can accept over USB PD Accept, not what the power supply can supply. Cell phones aren't being made with massive laptop-sized 100W accepting circuitry.
- jofzar 11mo ago
  > Accept, not what the power supply can supply. Cell phones aren't being made with massive 100W accepting circuitry. Surprisingly they are, supervooc goes up to 120w now (which is insane), there is also a Motorola phone which also does 68w via PD standard https://m.gsmarena.com/oneplus_15-review-2898p3.php https://m.gsmarena.com/oneplus_15-review-2898p3.php https://www.gsmarena.com/motorola_moto_g_stylus_5g_(2025)-13784.php https://www.gsmarena.com/motorola_moto_g_stylus_5g_(2025)-13... As for past through charging, it's actually apparently more common then I knew. Google does it as part of their "adaptive" charging (hits 80% then does pass through) and the OnePlus etc also do it with a settings for gaming. (Older article confirming this https://www.androidauthority.com/phones-with-bypass-charging-support-3509066/ https://www.androidauthority.com/phones-with-bypass-charging...)

whitehexagon 11mo ago

I was pleased to discover my old PinePhone allows this. It makes development much easier when having to swap the SD card every few minutes, and allows for simple power cycle via USB switch. What I cant figure out is how to detect power usage from the PMIC when in that configuration. ie seems to still assume power draw happens via a battery.