Those free Android apps may not be worth it. You save 99 cents or so, but you get ads that drain your smartphone’s battery. did a study that found the free version of the popular Angry Birds game, for example, had enough ads to use 45 percent of the power required to play the game. Ads in the game Free Chess hogged about 70 percent.

ZDNet said better programming could reduce this problem by more than half. But in the meantime, consider paying the 99 cents for an ad-free version of the game, rather than have your phone go dead when you least expect it.

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