We found the Asus Transformer Pad Infinity returned the kind of benchmark scores we really would anticipate from a top-flight Tegra 3 tablet, and it served to cement the performance we'd already experienced while using the tablet.
During general usage, the 19.5Wh battery (sans keyboard dock) lasted remarkably well. During looped 1080p video, with brightness maxed out and both Bluetooth and Wi-Fi running, the Asus lasted for 407 minutes – almost 7 hours of activity.
Of course, with the dock added that gets bumped up – to 14 hours, according to Asus.
The dock itself acts as a reserve battery and will charge the tablet up from its own stored power when the two are connected, meaning you can detach the tablet with the maximum amount of charge.
Either way, you won't struggle for power or longevity with the Asus Transformer Pad Infinity.