Ever since Nintendo’s Game & Watch handheld electronic games (1980-1991), playing games no longer meant being tethered to a TV. Gaming sans TV often means being far from the electricity-granting power cord that can deliver unlimited play time. As a result, on-the-go gamers have to obsessively watch the clock — and the battery power indicator — to see how many more precious gaming minutes they have left. Here are nine easy ways tips keeping that Nintendo DS or PSP chugging as long as possible.

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