iOS 15.3.1 battery drain by apps that use Bluetooth for Phone Key feature (Tesla, Proxy, Kwikset)

My battery is healthy and hold the charge overnight when the phone is powered off and unplugged. Once back on on the morning. It lost 10% in 30min while doing pretty much nothing. I am trying to turn all locations services off. Siri was already off. I will see if that helps. But this is just a pain. It have been 72h and the device is unusable. Bad, bad, bad update.

i will try to be patient and follow this great post. The last update killed my battery! - Apple Community

but what an terrible user experience!

I swear every other update has a battery 🔋 drain issue. I have a 13 not pro and mines having the same issue. Next update will say it’s to fix the battery drain problem. I kept telling my husband I’m barely on my phone at work. Yet I’m having to charge it while I’m there.

Since installing 15.3.1 the phone is useless. The battery drains so quickly, it's hardly usable. Just looking at maps for a few minutes drains the battery 25%. My security cam notifications take another 25%, messaging consumes 14%. I have full charge at the start of the day and am nearly dead by 4PM, without even using the phone. This is B.S. Apple and I want a full refund for my inconvenience!

And the result of the self discharge test?

And your country?

I ask questions for a reason

I am no longer following this thread as the ooriginal poster has not responded and there are two more requesters in this thread, That is not how the forum works.

Good luck.

I just upgraded to 15.4 this morning. I will report back my findings in a couple days after testing.