Logitech’s new iPad keyboard case has a four-year battery life

Logitech makes some of the best iPad accessories out there, but its new Slim Folio keyboard case for the 9.7-inch iPad has one particularly eye-catching feature: a four-year battery life.That’s because the Slim Folio uses replaceable coin batteries (like those you’d find in a wristwatch), instead of the usual rechargeable lithium-ion cells. This, combined with a low-power Bluetooth 4.0 connection to pair the Slim Folio to its tablet, means you can use it for two hours a day and expec