A Russian security researcher known as "Dark Purple" has created a USB stick that contains an unusual payload.It can kill everything from your laptop to your TV. It doesn't install malware or exploit a zero-day vulnerability. Instead, the customised USB stick sends 220 Volts (technically minus 220 Volts) through the signal lines of the USB interface, frying the hardware.

Whether you're using a smartphone, tablet, or laptop, here are some general purpose tips on prolonging its lifecycle and usage between recharge cycles.

Boost battery life:

1. Dim the screen brightness

You love your smartphone's large, colourful display, but it's the battery's mortal enemy.