Windows Update. In the taskbar search box, type Windows Update and select Check for updates. Choose the best power setting for what you're doing. Power slider. In the taskbar, select the battery icon, then choose Best performance, Best battery life, or somewhere in between. Conserve battery when it's low.. "/>
Answer (1 of 3): Oh the joys of owning a Dell their power supplies have a system that checks the voltage, current, oh and that you bought a Dell powersupply from them and not from someone else. I have a Dell Inspiron 15-7577. I recently had it repaired, I got the processor fan replaced and after I got my laptop back, I get this warning whenever I turn on my laptop, "Alert! The AC power adapter wattage and type cannot be determined. The battery may not charge. The system will adjust the performance to match the power available.".
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