Show battery percentage on your iPhone

iPhones show a battery meter at the top right of the screen, that shows you how much charge is remaining. You can also make that meter show an actual percentage of remaining charge, which lets you know more precisely when it's time to juice up again.

To show the battery percentage on your iPhone, tap on the "Settings" app (usually on your main home screen) and then tap "General".

Next tap "Usage" (I know - not very intuitive, but it's in there).

You can toggle "Battery Percentage" from Off to On just by tapping "Off".

That's all there is to it, but knowing where to tap is the key, and in this case it took a bit of tapping around to find it. Hope this is helpful :-)

My Geeked Out Road Warrior Survival Pack

I've built up a respectible arsenal of gadgets and devices while logging almost 200,000 miles in frequent flier miles this year.

Some are necessities, and some are just for fun. Some are just to keep my sanity on longer trips like the one I'm taking this week to Cologne, Germany.

My geeked out road warrior survival pack includes everything from a lithium-ion battery pack that gives my iphone 2 extra charges, to a sleek pair of noise canceling Bose headphones that block out the majority of jet airplane engine noises.

It also makes a great Christmas shopping list for the business traveler or technology addict in your life ;-)

Here's my Letterman's countdown of top ten must-have gadgets when traveling for business or pleasure:

10. Starbuck's Via 3-pack. Technology aside... Let's face it - hotel room coffee tastes horrible no matter what brand they use.

I really need a good cup of coffee to start the day off right (especially for east coast trips where it feels like I'm getting up at 4 a.m.) and these instant coffee packs from Starbucks are just as good as the real thing. You can get hot water from just about anywhere, including an in-room coffee maker without the coffee grounds.

9. iPod nano with armband. Yes, I have an iPhone too (see #1 below) but a small ipod is more convenient for working out, and also provides more hours of music for helping long flights go by faster.

8. Camera. I bring my Nikon D50 DSLR camera along with a 300mm zoom lens when I want to be sure and capture the city views in high quality (and I usually have some time after business hours for touring the city).

How to Triple Your iPhone Battery Life

If you own an iPhone 3G as I have for several months, then you're probably used to a daily battery charging routine. I usually charge my iPhone every morning and sometimes again during the day.

I also travel a lot and like to listen to music while flying, so I often get off the plane with a dead iPhone battery and can't check email or find where I'm at using Google Maps/GPS.

That all has changed after receiving a treasured Father's Day gift from my son, that's tripled the amount of time I can use my iPhone in between charges.

Sure, Apple provides several tips for conserving power and extending iPhone battery life, but they all follow a similar approach that basically involves NOT using important features like Wi-Fi, 3G wireless network speed, GPS location services, etc.

Basically all the features that drew me to the iPhone in the first place, and convinced me to trade in my Blackberry for one, are the ones Apple recommends I stop using in order to extend battery life. No thanks - I'm not about to turn them all off just to add a few minutes to an already short battery life. I would have stuck with my Blackberry if that was the end of the story. Fortunately it wasn't.

The gift I received from my son was a Tekkeon MP1800 lithium-ion rechargeable battery pack that gives me 2 1/2 iPhone charges, so I can stay powered up even when I don't have an outlet nearby.