# Battery dead

**URL:** <https://community.cartalk.com/t/battery-dead/183917>\
**Category:** General Discussion\
**Created:** [April 30, 2022, 7:39pm UTC](https://community.cartalk.com/t/battery-dead/183917 "2022-04-30T19:39:00Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![spottsdaniel5\_180602](https://avatars.discourse-cdn.com/v4/letter/s/58f4c7/32.png) [@spottsdaniel5\_180602](https://community.cartalk.com/u/spottsdaniel5_180602)\
**Post date:** [April 30, 2022, 7:39pm UTC](https://community.cartalk.com/t/battery-dead/183917/1 "2022-04-30T19:39:00Z")

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Would using the cigarette lighter socket to charge a phone while using the sound system to watch TV/movie drain the battery?

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**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\
**Post date:** [April 30, 2022, 7:48pm UTC](https://community.cartalk.com/t/battery-dead/183917/2 "2022-04-30T19:48:10Z")

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Yes of course it will .

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**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/48514_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\
**Post date:** [April 30, 2022, 8:06pm UTC](https://community.cartalk.com/t/battery-dead/183917/3 "2022-04-30T20:06:17Z")

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The key detail–which the OP omitted–is whether his engine was running while charging the phone and watching a video.  
If the engine was running, it shouldn’t be a problem, as long as his alternator is healthy.  
If this was done with the engine off, then–yes–it will drain the battery.

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**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\
**Post date:** [April 30, 2022, 8:22pm UTC](https://community.cartalk.com/t/battery-dead/183917/4 "2022-04-30T20:22:21Z")

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Eventually, yes. When power was interrupted due to a storm I would charge my phone in my truck, battery had enough capacity to charge the 2200 mah phone without problem. But more phone charging without recharging the truck’s battery would eventually drain it.

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**Author:** ![bing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bing/32/4619_2.png) [@bing](https://community.cartalk.com/u/bing)\
**Post date:** [April 30, 2022, 9:43pm UTC](https://community.cartalk.com/t/battery-dead/183917/5 "2022-04-30T21:43:14Z")

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Depending on how old your battery is.

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**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\
**Post date:** [April 30, 2022, 10:11pm UTC](https://community.cartalk.com/t/battery-dead/183917/6 "2022-04-30T22:11:41Z")

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Your “sound system” draws 10 times more current than your telephone.

That little battery in your phone cannot draw all of the energy out of a 40 pound lead acid battery.

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [May 2, 2022, 10:43pm UTC](https://community.cartalk.com/t/battery-dead/183917/7 "2022-05-02T22:43:55Z")

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Doubtful charging a cell phone would do it, but running the stereo-entertainment electronics definitely could. especially w/ tv-type screen, or the sound was pretty loud.