November 06, 2012, 9:06 PM — I live in New Jersey, in an area hard-hit by Hurricane Sandy. Before the storm hit, my family took the traditional preparatory steps: We bought non-perishable foods, stocked up on water, took in our lawn furniture, and so on. But we also prepped our electronics for the coming storm -- chiefly, by charging up our iPads, iPhones, and laptops.
We lost power on Monday, October 29, and it wasn't restored until the evening of Sunday, November 4. Seven days without power is a long time. Of course, the biggest problems were the cold and the food spoilage. But with the Internet out, we also lost our home phone service (which uses VoIP). Nearby cellphone towers took a beating, as well; early on, our iPhones lost service completely. Eventually, AT&T and T-Mobile started pooling their resources to let customers get online, so phones linked to one provider would occasionally show carrier logos for the other.
Our phones eventually went from mostly useless to occasionally able to send SMS text messages and place heavily-distorted phone calls. But that came with a cost: Our iPhones struggled so mightily to make even those basic connections that they gobbled up battery power far faster than usual, while accomplishing far less. With limited options for recharging our iPhones, we had to do what we could to maximize battery life.
Preparing for the long haul
The first few steps were easy: We turned off Wi-Fi, so that the phones wouldn't waste energy scanning for wireless networks that weren't there. We turned off Bluetooth, too. (Both are top-level options in Settings under iOS 6.) We dialed down our Brightness settings as low as possible -- though that option was slightly harder to stick with: Our iPhones worked far better outside, and in sunlight the darkest screens were hard to read. Very dark iPhones are also subpar makeshift flashlights, which we needed with the power out.
I am fortunate enough that my job with Macworld affords me a slew of devices that can help juice iPhones in need. My collection of iPhone battery cases is huge: Before Sandy hit, I charged up five such cases. The only glitch: the ones I had work only with the iPhone 4 and 4S, so they could charge my wife's iPhone, but not my iPhone 5.
To take care of my iPhone 5, I turned to a few other options: the PowerBag Business Class Packa backpack with a built-in battery and the ability to charge devices over USB; a generic recharging device with USB, dock connector, and Micro-USB ports; and my car, thanks to a drugstore-purchased USB/cigarette-adapter plug. We also had three fully-charged laptops that could function as iOS device chargers in a pinch.