How much does BT drain the iPhone Battery

[chefwong]

my X battery is draining. Maybe coniciental, but it seems like it was since the 4.2 update

https://forums.macrumors.com/threads/charging-preferences-iphone-iwatch.2094195/#post-25579346


See thread above. Overnight, full charge on both devices, watch on power reserver mode, I woke up to a drained battery today - aka, it shut itself off drained.. Does the constant BT connection (off a charger) cause this drain ?

 

[deeddawg]

Very little.

BT isn't going to be the cause there. At least not in itself.

Think a moment... what's changed between when it was working properly and when it wasn't... Maybe the 4.2 upgrade. Maybe a stuck app.

If you haven't yet done so, hard-reboot both devices and see if the behavior remains. Go to Settings->Battery and look to see which apps are using the most power.