On Windows, you can generate a detailed "Battery Report" to see how much life is left. Open (type cmd in the search bar). Type powercfg /batteryreport and press Enter . Open the file link provided (usually in your Users folder).
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Compare to Full Charge Capacity . If the latter is much lower, it's time for a new one. 🛒 Step 2: Where to Buy On Windows, you can generate a detailed "Battery