Smartphones these days are impressively powerful, but their admirable multitasking skills can often prove shortlived: battery drain is a real issue. Android users can easily tweak their phone settings to optimise its battery’s staying power, of course. But if you’re out and about all day, constantly checking messages, web surfing and listening to albums, you’ll be out of luck by the time you’re ready to kick back and watch a comedy on YouTube. The PowerSkin AP1511SEN Silicone Case with Built-in Battery pack can power your HTC Sensation for up to 360 more talktime minutes 225 and can boost the standby time by 225 hours. The tough case is made from recycled materials, is non-slip and contains a 1500mAh battery.