ASUS promises 9 hours of video playback on the Eee Pad Transformer, but has an ace up its sleeve with the keyboard dock. This has its own, separate battery that ASUS says offers an additional six and half hours of use. If both the tablet and the keyboard dock batteries are fully charged, the Eee Pad Transformer draws power from the keyboard dock first in order to preserve power for tablet-only use.

Toshiba quotes a more realistic 7-8 hours with its battery, and has one feature that no other Android tablet currently boasts -- the battery is removable and replaceable. A switch on the left side of the tablet unlocks the rear cover and you simply pull it off to remove. Toshiba sells an additional 6-cell battery for $79.95.

Disappointingly, both the Toshiba Tablet and the ASUS Eee Pad Transformer do not charge through their standard mini and micro-USB connections. The upside to this is that use of different ports can charge the devices much faster that a USB connection can. The Toshiba Tablet's battery can be charged to 90 per cent of its capacity in just one hour, while the Eee Pad also charges much faster than most other tablets on the market.