Battery and Charger
Samsung includes a 44 watt-hour, 4-cell lithium polymer battery that's rated to deliver "up to 9 hours" on a charge. Also provided is a 40-watt AC adapter with detachable IEC C5 "Mickey Mouse" power cord and cylindrical right-angle power connector for the DC power. This connector is thinner than most and tended to slip out of its socket during tests. Charging feedback is provided by the Book 9 by an LED that's visible only when the lid is open; the Windows 8 Lock Screen displays a battery-charge fuel gauge.
The MacBook Air comes with a 54 watt-hour lithium polymer battery that's rated 10 hours of movie playback, 12 hours of wireless web and 30 days of standby time. It's charged with a 45-watt MagSafe 2 power adapter with Apple's proprietary AC power connector and magnetic connector for the laptop side. An LED on the MagSafe connector shines amber while charging and green when charged. Neither company's batteries are user-replaceable.