We may not be able to get a spare battery for the Eee PC directly from Asus, but that has never stopped third party manufacturers from offering up accessories. The latest is a battery charger from expansys and is very unique, it will allow you to charge your spare battery while you are using your Eee PC. It will reach a full charge within 4 hours and has dual LED lights that indicate the status of the current charge. The spare battery charger will be available beginning July 31 and retail for $40.95.
Product [expansys] Via [Liliputing]
how to buy expansys announces baterai charger for asus eee pc 4 g