# Does a battery weigh less as the charge leaves

**URL:** https://boards.straightdope.com/t/does-a-battery-weigh-less-as-the-charge-leaves/995796
**Category:** Factual Questions
**Created:** [January 8, 2024, 10:39pm UTC](https://boards.straightdope.com/t/does-a-battery-weigh-less-as-the-charge-leaves/995796 "2024-01-08T22:39:18Z")
**Posts on this page:** 1
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### Author: ![Cervaise](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/cervaise/32/16693_2.png) [@Cervaise](https://boards.straightdope.com/u/Cervaise)
#### Post date: [January 8, 2024, 10:46pm UTC](https://boards.straightdope.com/t/does-a-battery-weigh-less-as-the-charge-leaves/995796/3 "2024-01-08T22:46:48Z")

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I was pretty sure something like this was discussed previously:

> [@Weight difference between fully charged and discharged phone](https://boards.straightdope.com/t/weight-difference-between-fully-charged-and-discharged-phone/947319):
>
> So what is the difference in weight between full and empty battery in mobile phones. Can that be used as a measure for weight of energy? If not why not.

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