You want to maintain battery health but store it without use for a time. Do what the factory does. Charge to 50% or 60%, and turn it off. Then store it. Best for battery protection and longevity if stored

I set my new S9 ultra… to charge no more than 85%. That’s a setting there

0% is the worst you can do to a battery. 100% isn’t good either.

I let my Samsung S20 FE warranty replacement sit dead for 2 years and went to use it and the battery had to be replaced. I have let iPhones sit for that long and never had an issue with them working again.

If I leave it in storage at 50% how long should the battery last before it degrades?

li ion batteries are never really at “0” - that’s just a figure showed to the consumer.

In reality, in very lay man’s terms, the batteries are hibernating when it’s 0. They will continue to “lose” energy as per usual (like how when you’re starving, it doesn’t mean you are on the verge of death). When the minimum energy level goes below a certain amount necessary for life support, the battery will suffer physical damange, you can no longer wake it up unless you bring it to a hospital and get a professional to resuscitate the battery by doing something dangerous.

So yeah, you can leave it a 0%, just that your phone may never wake up again if you leave it alone too long.
You leave it at 50%, it will depend on how long it takes for the phone to lose 50% energy in your environment, then you’ll be in the same situation as the 0% one.

That’s why new phones are charged to about 80% or 90% when sealed in a box - you’ll never know how long the phone is going to sit on the shelf. That should be good for a few years.

Why not charge it and switch off till you’re ready to use it. The Nokia smartphone I got few months back via CryptMI, I wasn’t ready to use it and that was exactly what I did.

Nope, charge it between 40-60%

Empty and full are the worst conditions to store a battery in.