iPhone 4 is an awesome smartphone. It is capable of many things. Unfortunately, it can’t run forever. The last thing you want to deal with is your phone running out of battery when you are on the go. That’s where battery extenders come into play. They add hours of play time to your phone and let you get more out of it when you don’t have access to a power outlet. Here are 5 iPhone 4 battery extenders that offer just that:

New Trent ultra-pack IMP880 8900mAh External Battery pack: works with iPhone 4 and iPad. Adds 50 hours movie time for iPhone 4 and 20 hours movie time for 3G iPad.

Satechi iCel 4800 mAh (2 amp) Battery Extender: a high quality battery extender that works with your iPhone and other USB powered devices.

splash O2 Lite Slim-Profile Extended Rechargeable Battery Case: a hybrid accessory for iPhone that not only adds hours of play time to your iPhone, it protects your device from scratches too.

New Trent Dual-port Pack IMP50D Battery Extender: adds 38 hours movie time to iPhone 4. Allows you to charge 2 devices at the same time.

Konnet PowerEZ Plus Lithium Battery Pack: a portable battery that adds to your battery life. It has a kickstand that keeps your device secure on your table or desk. It offers short-circuit and over-current protection too.

What’s your favorite battery extender for iPhone 4?

If you have been watching TV lately, you have probably heard about Powermat. Powermat PMM-HO100 is an innovative charger that helps you charge your iPhone and other gadgets without having to use wires. The device is designed to charge your devices wirelessly. All you have to do is connect the receiver to your gadgets and put them on this charger. No wires and no hassles involved.

Your Powermat includes Universal Powercube with 8 interchangeable tips (Mini and Micro USB, Apple, Samsung, LG, Nintendo DS Lite and DSi, and Sony PSP), so you can charge all your popular gadgets easily without having to look for their chargers. You can also charge a fourth device using the additional USB connection.

All in all, Powermat is an innovative solution that saves you a lot of headache and makes it easy to go wireless at home or in your office. If you are into the latest high-tech innovations, Powermat is a must have.

If you own an iPhone, you probably know that the battery could be better. It’s gotten better with the new generation, but it could always be better. While you can’t buy an internal battery to lengthen the battery life on your iPhone 3GS, you can always purchase an external battery and take it with you when you need it. IMP500 A iPhone 3Gs External Battery is a cool power solution for iPhone 3GS that lets you get over 38 hours of extra movie time on the go.

IMP500 is a Lithium-Ion Polymer battery that not only adds extra hours of battery life to your iPhone, it also doesn’t require you to take a large accessory with you on the go. It’s very portable and doesn’t weight too much, so it’s much easier to take it around with you in airports, train stations, and so on.

I found IMP500 to be very solid and reliable. It adds over 180 hours of audio time, so if you are not using your iPhone to watch videos, you are going to get a plenty of play time on your iPhone. You can power up this battery through USB and use the same connection to charge up your iPhone as well. It also works with Blackberry and other cell phones as well. Great accessory to own for emergency situations.

Many folks are just realizing the benefits are going green in their everyday life. Green solutions are not as expensive as they used to be, and they let you save money in the long run. Take solar chargers for iPhone 3GS. Devices such as Senyx iPhone 3GS Solar Charger let you power up your phone on the go by using the power of the sun to your advantage. So as long as you are in a place that has access to sunshine, you are going to have a way to power up your iPhone 3GS.

Senyx iPhone 3GS Solar Charger fits all the latest iPod and iPhone. It’s very easy to use. All you have to do is charge it up (give it ample sun exposure), and connect it to your iPhone’s power port. You are all set.

This is one portable charger for your iPhone. So you won’t have any trouble carrying it with you when you are on the move. All in all, if you are looking for an alternative battery solution for iPhone 3GS, Senyx solar charger is a good gadget to consider.

One of the biggest issues with iPhone is the battery life. iPhone 3GS has been improved in this area, but if you own an iPhone 3G, you are probably tired of having to keep charging your iPhone every couple of hours. That’s where battery extenders such asTekkeon MP1200 come in. These solutions not only enhance your iPhone’s battery life, they charge your phone as well. Tekkeon MP1200 myPower iPhone Battery/iPhone Sleeve actually does more than that. It is not only a cool battery extender, but it’s also a decent case that keeps your iPhone safe.

Tekkeon MP1200 comes integrated with a battery that doubles the life of your iPhone’s battery. Once you connect it to your computer, it charges its own battery and your iPhone’s battery at the same time. MP1200 also acts as a dock and syncs your iPhone with iTunes as well. I was very impressed with MP1200 as it really lived up to its promise. The case is solid and protects your gadget against scratches and everyday wear and tear. If you are looking for a case and battery extender at the same time, there is no better way to get them both than picking up Tekkeon MP1200.

Kensington Mini Battery Extender does exactly what it promises to do. It helps you get more out of your iPhone 3G when you are running out of battery. It extends play time up to 30 hours of music or 6 hours of video (on iPod nano 3G) or 3 hours of talk (on iPhone). That means if your iPhone runs out, and you don’t have immediate access to a place where you can charge your phone, you can use your extender to stay in touch.

What I like about this battery extender is the fact that it’s very portable. You are not adding a lot of bulk by adding this add-on. And you can charge your iPhone and Battery extender at the same time. It’s mainly for emergency situations, but it does the job well. If you are looking for an insurance policy just in case your iPhone’s battery runs out, Kensington Mini Battery Extender is a good iPhone accessory to consider.

Want to kill two birds with one stone? i.Sound 2-in-1 Charger and Back Up Battery is a backup battery source and a charger for iPhone 3G all in one device. If you are stuck on the road or just don’t have access to a power source, you can use this back up battery to enjoy 3 hours of extra battery time on your iPhone 3G. That also means that you can go with this backup source for 30 hours.

The adapter is easy to carry too. You can use it to charge your battery fast. You can also use the retractable USB cable to connect your device you a laptop and charge it that way. The battery indicator tells you exactly how much power you have left. Overall, this is a great alternative to Kensington’s back up battery solution for Kindle 2.0.

iPhone used to get a lot of flak for not being green enough a couple of years ago. Apple did take some steps to make iPhone 3G more environment friendly. But you can go one higher by using Lenmar PPUS20 PowerPort Solar Charger & External Portable Lithium Ion Battery. This hybrid charger lets you charge your phone by using the power of the sun, regardless of where you are. You can also use the included tip to charge from the USB port of any computer.

What I like about this hybrid charger is the fact that it can store power for up to one year and lets you get your iPhone running on battery. The battery can be charged up to 500 times, and it’s not just compatible with your iPhone or iPod. You can also use it to power up your BlackBerry, Motorola RAZR, LG, Samsung. You can also buy additional tips to charge up even more devices.

The fun thing about using this solar charger is that you no longer have to look for a power plug to charge your iPhone while you are on the move. Just use the power of sun and charge up your phone at all times (unless you don’t have too many sunny days in your location). Overall, if you are looking for a green alternative for your iPhone charger, Lenmar PPUS20 PowerPort iPhone Solar Charger is a good choice to go with.

Kensington Battery Pack for iPhone 3G is a cool accessory for your phone that extends playing time up to 100 hours of music, 21 hours of video, or 6 hours of talk. This is one of the best accessories that you can buy for your phone. Nothing’s more frustrating than forgetting to charge up your phone and be in a situation where you need your phone but you are out of battery. With Kensington Battery Pack, you can make those emergency calls. You can also charge your phone with the dock connector.

What I like about this package is that you can use it to power up your other gadgets as well. Everything you need is included, so you are not spending money on an iPhone-only add-on. Here is what you get with your package:

• Battery Pack
• Charger
• Input power cable
• Dock connector
• Mini-USB cable

Overall, if you are looking for a cool power accessory for your iPhone that lets you charge up your gadget when you are in another continent or stuck on the road, you should get Kensington Battery Pack and Charger for iPhone.