Apple has announced that its range of Apple Watches will be available from April 24th, with prices beginning at $350 and getting up to $17,000 for the 18-karat gold Edition. Launching in nine countries, Apple says its 18-hour battery life will enable all-day usage – but evidently not sleep tracking, as you’ll need to charge it on your nightstand, using its MagSafe connector. With a range of customizable watch straps, which largely determine the price of the units given the similarity of the hardware between the 38mm and 42mm units, Apple is stressing the individual personalization that is available to customers – which it hopes will spur adoption for fashion-conscious buyers. With CEO Tim Cook declaring that this was the…