You’re storing your backup phone without a charge
If you’re hanging onto your old phone as a backup for when you inevitably drop your new 6S in the toilet, make sure you stash it in a cool place, roughly half-charged. According to Apple, it you leave the battery completely depleted it will fall into what’s known as a “deep discharge state,” which apart from sounding like a nightmarish medical issue, will render it less capable of holding a charge in the future. Conversely, if you store it fully charged for an extended period, it may lose some capacity as well.
You’re using the wrong charger
Your Apple-issued charger is designed to cut power when the battery hits 100%, but those cheapo unauthorized third-party USB cords are not, and may do some damage by excessively juicing the battery. Plus, ya know, they could kill you.
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Joe McGauley is a senior writer for Thrillist who gets heart palpitations every time his low battery message pops up.