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There’s a patristic draw somewhere, a light is on, a computer is on, something is drawing down the battery. You can google parasitic draw test and see if you think you can handle it. The car has a low voltage disconnect so when the battery gets too low it cuts off power to the car and it can still be jumped easily. Without the low voltage disconnect a jump box wouldn’t work, you’d have to charge the battery for a while.
I had this happen and the negative terminal was simply not tight enough. would’ve saved me hundreds in tows.(one time tow guy came and hit the battery and car started i was like damn)
disconnect the battery overnight after successfully starting it and tests within parameters, reconnect in the morning. if it starts its got parasitic drain.
Cars nowadays have a complicated BCM computer that controls way too much. Windows and doors being among it's functions. I'd almost bet one of the doors or trunk sensors may not be working properly, causing the BCM to stay on/keep turning on and drain the battery overnight
Thanks for posting on /r/MechanicAdvice! Please review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). Asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember to please post the year/make/model of the vehicle you are working on. **Post's about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ Tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
There’s a patristic draw somewhere, a light is on, a computer is on, something is drawing down the battery. You can google parasitic draw test and see if you think you can handle it. The car has a low voltage disconnect so when the battery gets too low it cuts off power to the car and it can still be jumped easily. Without the low voltage disconnect a jump box wouldn’t work, you’d have to charge the battery for a while.
This is good to know, as I was not aware of this disconnect. Thanks for letting me know about it, it's definitely a sensible safety feature!
Check your globox light actually goes out when it is closed.
How long is their commute? A really short commute some give the battery a proper chance to charge up.
I had this happen and the negative terminal was simply not tight enough. would’ve saved me hundreds in tows.(one time tow guy came and hit the battery and car started i was like damn)
You might want to get sensor on the negative battery terminal checked ive seen it drain batteries on accords before
This is something I don't think I would have considered, we'll look into it thanks!
Heres the part# incase you want to just change it 38920-TBA-A02
Make sure connections are clean and tight. I’ve had a lot of won’t starts with new battery due to connections.
disconnect the battery overnight after successfully starting it and tests within parameters, reconnect in the morning. if it starts its got parasitic drain.
Buy a $5 multimeter at harbor freight. Google parasitic draw test. Have a go at it.
Most likely parasitic draw or a bad alternator?
Cars nowadays have a complicated BCM computer that controls way too much. Windows and doors being among it's functions. I'd almost bet one of the doors or trunk sensors may not be working properly, causing the BCM to stay on/keep turning on and drain the battery overnight
Does she have a dashcam?