This blog post from David Pogue of the New York Times offers some useful tips for how to extend iPhone battery life. Nothing truly surprising, but it’s a great reminder to check on push, location, and notification settings to make sure you’re not allowing apps to waste battery life working unnecessarily in the background. follow link
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If you're using Boom to increase the volume on your Mac, you can change the amount to which Boom increases the volume quickly in two ways. Either use the slider available from Boom's menu bar icon, or enable and set hotkeys (Command-Shift-+ and Command-Shift-- by default). Then, when you need that push to 11, more volume is available at the click of the mouse or tap of the keyboard.
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Pogue’s Tips for Extending iPhone Battery Life