If you are a smartphone user, you might have experienced your mobile battery running out of power while surfing on 3G networks, Wi-Fi or streaming content to the device.

In such situations you will need a backup battery, more so if you carry a touchscreen 3G device. However, you should make sure that you get one to charge multiple devices.

To find out how many times a phone can be charged with the portable charger, you would need to divide the mAh of the charger by the mAh of the phone.

Here are a few portable battery chargers that are available online and in store to provide you with a seamless experience when you face battery woes next time.

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MIFLIP
Price: Rs 2,500

MiLi Power's MiFlip is a smartphone charger, backup battery pack and viewing stand. It eliminates clutter as it combines three accessories into one lightweight and portable device.

MiFlip is compatible with Apple iPhones, iPod Touch and BlackBerry. It can charge your device for eight hours of talk time, 15 hours of video or 80 hours of music streaming. If you do not get it at stores, you will find it on online.

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IGO CHARGE UNIVERSAL POWER EXTENDER
Price: Rs 2,000

The iGo Charge Anywhere portable mobile phone charger comes with two USB slots allowing the user to charge two devices simul-taneously. Be-sides being a portable charger, it can be used as a wall charger. This means that while the battery on the device is charging, it also supplies power to the USB ports.

This battery backup charger can be used for a wide range of mobile electronic devices, iPhones, other mobile handsets, Bluetooth headsets, MP3 players, gaming devices, digital camera and GPS devices. The compact design makes it  easy for all users, including businessmen stranded at places where there are no power plugs.

This device comes with an 1,800 mAh battery and could charge an iPhone twice. Easily available on igo.com.

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PEBBLE CHARGER
Price: Rs 4,000

The Palm-sized Pebble Charger has a 5,000mAh battery inside it. That is around four times the size of your smartphone battery.

The device takes little under five hours to fully charge but is worth the time since this portable charger can fill an iPhone for up to eight hours.

Apart from the iPhone, the Pebble Charger is compatible with other mp3 devices, Nokia and Sony Ericsson handsets, and devices that can be recharged using a mini USB.

A rubbery finish ensures that  it would not slide off a smooth surface while you are on the move. A handy blue LED charge indicator makes sure that you recharge your smartphone completely.

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ETO 3800
Price: Starts at Rs 2,450

Green powercell technology's Eto portable charging comes with multiple connectors to charge all brands of mobile phones, smartphones, iPods & MP3 players and portable gaming consoles, among others.

It can also be used to charge digital cameras and camcorders. We were able to charge three smartphones from zero battery to full and an iPod player with a single charge from Eto 3800.

The time taken to charge the device to its full capacity is 2.5-3 hours. With a Lithium ion battery and a capacity of 3800mAh, the output voltage of the devices is 5.5V/16V/19V.

An LED charge indicator tells you how much the device has charged. It also comes with an auto cut-off feature and overcharging protection circuit. Eto 3800 comes with a 12 months replacement guarantee and is available at Spice HotSpot stores, leading mobile outlets and can also be ordered on letsbuy.com.

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POWERSTICK
Price: Rs 3,000

The Powerstick is a portable charger that allows it to charge a variety of devices. It looks very similar to a large USB drive. The device has a USB plug at one end and on other a connector that allows you to plug in a variety of devices for charging.

The Powerstick includes a micro-controlled processor, so when the device is charged, it switches off.

While it may look like an extra beefy USB flash drive, this handy little device actually packs in 750mAh battery within and can provide an emergency boost to your mobile phone, BlackBerry, or portable music player.

To charge Powerstick, it has to be connected to any USB port including computers and laptops and takes up to 90 minutes. You can order it on powerstick.com