Extra battery

[Josh_Cook]

Currently, I’m thinking of a way to fit multiple 18650 cells into a housing that would go along the width of the laptop and use only 2 expansion card slots (one on one side is only for stability) with a Buck-boost converter to convert the charging voltage to the appropriate voltage. For this, I need to know the exact voltage it requires.

[Samuel_Murray]

@Kieran_Levin mentioned here that there is an internal buck-boost capable of 5-20V.

[Josh_Cook]

Yep so that makes it a bit easier.

[Tyler_S]

@Samuel_Murray I thought the same thing but was corrected on DC plug expansion card for compatibility with more power adapters - #7 by GameFan

@Kieran_Levin

you would need to comply with the PD protocol and advertise the correct power to the device, and also support 5Vsafe to start negotiation of a PD contract.
You cannot just apply power to the type-c input as the laptop needs to know the charger power to prevent overloading the charger as we control the power envelope of the system based on the negotiated power contract.

I am a lot more excited about PD-Legacy charger adapters so I can continue to use my old laptops and only need type-c chargers :D.