How to make a recharable battery last longer?

I got a new iPhone and after awhile rechargeable battery's will fade and lose their max battery life. I was wondering is it better for the battery to charge it back to 100% every chance you get or to let the battery run low then charge all the way back up.How to make a recharable battery last longer?Lithium ion batteries prefer to be slightly discharged and then chargeed back up. So if you want to get the longest life make sure to charge it as often as possible. Preferably before it gets below 40%.How to make a recharable battery last longer?Do this 3 times. Charge battery to full, discharge battery until it's dead. This will extend the usage time of the battery.

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