Why is my phone battery draining overnight even with everything closed?

[Paisley46]

My new phone’s battery drains almost 20% overnight even with everything closed, and it’s not even a week old. When I check the battery stats, most of the drain seems to come from mobile network standby, which feels odd because my signal at home is usually strong. I’m trying to figure out whether this is a software issue, a hardware defect, or just how this model behaves when idle.

[PaulH]

A new phone losing that much battery overnight doesn’t feel normal to me, at least not after the first couple of days. I usually expect some background churn early on, but 20 percent still sounds high if nothing is running.

[Mila.T]

I’ve seen overnight drain tied to the radio more than apps. Even with good signal, the phone can keep negotiating the network if something about the connection isn’t stable, and that adds up while it’s idle.

[ThomasT]

On a similar device I tried cutting background data and limiting background activity, but it barely moved the needle. The drain was still there, which made me suspect something deeper than just app behavior.

[Lily_M]

In one case a software update helped after a week or so, but I’ve also seen phones where updates changed nothing at all. It’s frustrating because you don’t know if you’re waiting for a fix that may never come.

[Oliver.M]

I once spent an evening convinced my phone was being probed remotely, only to find out a cheap smart device on my network was constantly reconnecting. That calmed me down a bit about every spike meaning something serious.

[Tyler.S]

I keep thinking about setting up alerts or automation, but every time I try, the notifications get noisy fast and I stop paying attention altogether. The signal to noise ratio feels bad.

[BrianXG]

Have you tried leaving it in flight mode overnight just once to see if the drain drops noticeably?

[ZoeyIM]

Since it’s that new, I’d be tempted to back everything up and do a factory reset just as a test. Not because it’s convenient, but because it’s one of the fastest ways to tell software weirdness from hardware behavior.

[KyleTC]

One thing that caught me off guard was how much battery indexing and optimization can happen in the background during the first week. Even if nothing looks active, the phone can still be learning usage patterns and syncing quietly overnight.

[KyleTJ]

I noticed my overnight drain dropped a lot once I disabled always-on features like constant location scanning and background Bluetooth checks. It didn’t eliminate the issue entirely, but it made the idle drain feel more predictable.