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Good luck with what? Not using a Wii U pad? Not really difficult according to users on this board, I should be able to use a Pro Pad and have it last '50 hours on a single charge" due to the lack of Rumble.
Don't forget a lot of games will use the GamePad intensively.
There will be options to not use it, hell look at ZombiU: most extensive use and even it allows you to use a Wii remote.