The PocketCell is a chocolate bar-sized battery which can be used to charge or top up your phone or tablet battery. It measures just 90x28x20mm and weighs 70g, so you can pop it in your pocket to give your smartphone a boost if it's running low on juice. Visit: Group test: what's the best smartphone accessory?
Innergie's PocketCell has two USB ports. One is micro-USB for charging the battery and the other full-size USB for charging your device.
In the box is a 'Magic' cable which has an Apple 30-pin connector plus micro- and mini-USB ports. This means you can charge most USB devices - only devices with other proprietary standards such as Samsung tablets will require you to use the USB cable that came with the device.
The Magic cable is made to a high standard and just 19cm long, so it's convenient to carry with the PocketCell. You can use the Magic cable to charge the PocketCell by using the micro-USB connector and connecting the other end to a laptop or PC's USB port or a mains adaptor (which you'll have to buy separately - none is included).
The PocketCell comes pre-charged and its 3000mAh capacity (impressive for its size) should be enough to fully charge your smartphone from empty and give your tablet a top-up to get a few hours' extra use from it. A button on the side turns the battery on to start the charging process and also shows the PocketCell's current charge level by lighting up to four blue LEDs.
We tested the PocketCell by charging an iPhone 4S. It fully charged the smartphone in a little under two hours, and had power to spare. Enough, in fact, to charge a second iPhone from empty to 19 percent. Built-in over-voltage protection means the PocketCell can detect what's plugged in and ensure it delivers the appropriate amount of power.
It wasn't quite as impressive when charging an iPad 2. Our iPad's empty battery was charged to just 27 percent before the PocketCell was exhausted, but at least it did this quickly thanks to the fact that it supplies the same 2.1 amps as the iPad's mains charger. Recharging the PocketCell from a USB 2 port isn't exactly a fast process - it took roughly 2.5 hours. It was considerably faster when using a 2.1 amp mains adaptor, such as the iPad's.
The PocketCell will go on sale in July (possibly August) so we've based our review on the RRP of £79. The actual price you'll pay could be lower than this, making it better value.