# Extra battery

**URL:** <https://community.frame.work/t/extra-battery/6555>\
**Category:** Creators & Developers\
**Tags:** project\
**Created:** [September 10, 2021, 9:12pm UTC](https://community.frame.work/t/extra-battery/6555 "2021-09-10T21:12:10Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Josh\_Cook](https://avatars.discourse-cdn.com/v4/letter/j/f0a364/32.png) [@Josh\_Cook](https://community.frame.work/u/Josh_Cook)\
**Post date:** [September 10, 2021, 9:12pm UTC](https://community.frame.work/t/extra-battery/6555/1 "2021-09-10T21:12:10Z")

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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.

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**Author:** ![Samuel\_Murray](https://avatars.discourse-cdn.com/v4/letter/s/91b2a8/32.png) [@Samuel\_Murray](https://community.frame.work/u/Samuel_Murray)\
**Post date:** [September 10, 2021, 10:19pm UTC](https://community.frame.work/t/extra-battery/6555/2 "2021-09-10T22:19:35Z")

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@Kieran_Levin mentioned [here](http://community.frame.work/t/what-voltage-is-required-to-charge-the-framework-laptop/5034/6) that there is an internal buck-boost capable of 5-20V.

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**Author:** ![Josh\_Cook](https://avatars.discourse-cdn.com/v4/letter/j/f0a364/32.png) [@Josh\_Cook](https://community.frame.work/u/Josh_Cook)\
**Post date:** [September 10, 2021, 10:35pm UTC](https://community.frame.work/t/extra-battery/6555/3 "2021-09-10T22:35:39Z")

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Yep so that makes it a bit easier.

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**Author:** ![Tyler\_S](https://avatars.discourse-cdn.com/v4/letter/t/dc4da7/32.png) [@Tyler\_S](https://community.frame.work/u/Tyler_S)\
**Post date:** [September 13, 2021, 2:12pm UTC](https://community.frame.work/t/extra-battery/6555/4 "2021-09-13T14:12:27Z")

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@Samuel_Murray I thought the same thing but was corrected on [DC plug expansion card for compatibility with more power adapters - #7 by GameFan](http://community.frame.work/t/dc-plug-expansion-card-for-compatibility-with-more-power-adapters/6480/7)

> [@DC plug expansion card for compatibility with more power adapters](http://community.frame.work/t/dc-plug-expansion-card-for-compatibility-with-more-power-adapters/6480/6):
>
> 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.