GET THE BEST FROM YOUR BATTERY

If you’re feeling frustrated that your laptop won’t quite last a full working day on battery power, just remember how far we’ve come. In the early days of laptops, you could expect to get only two or three hours away from the mains, and even that would drop off over time.

Then again, those 20th century battery packs did have the benefit of being removable, so you could extend your working time by snapping in a spare to replace an exhausted battery. And if a battery’s capacity degraded too much to