Battery packs are fine.
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There are two kinds of xbox wireless controller, one is the battery pack. One is rechargeable batteries. The battery pack has a charger that plugs directly into the handle to charge. You can charge it while you play. But the battery pack is not good. Power is poor, turn on the vibration will play for two days, more than ten hours. I can't. Good rechargeable batteries last 7-8 days. More than 50 hours. I still tend to rechargeable batteries, rechargeable batteries are good to buy, battery pack fake too much, not easy to get!!