does the battery in iphone become damaged and drained if you store it without being charged?

I

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I have an iPhone 5 that I didn't use, but kept as a backup in case of an emergency or if one if my other phones became damaged. Now that I'd like to start using it, I have some concerns about whether I skewed the battery at all by lack of use and what can be done about it outside of changing the battery.
I honestly don't recall if there was any charge or not on the phone when it was stored in its box under room temperature conditions. I received the phone from my carrier.
I've heard conflicting information from the battery will drain to the current lithium batteries in iPhones have a "reserve" so there shouldn't be any damage to the battery.
 

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