I lost my original laptop charger, and my sister gave me a replacement. The laptop recognizes that it's plugged in, but it says there's a problem with the power being supplied. I'm not sure whether this is a hardware or software issue. The battery health is showing 78%, and I don't understand what that means. How can I tell whether the charger is compatible, underpowered, or whether the battery itself needs replacing?
4 Answers
First, check whether the replacement charger is actually intended for your laptop. Compare its voltage, amperage, and wattage with the requirements printed on the laptop or listed in its manual. An incompatible or underpowered charger can be detected as connected but still fail to provide enough power, especially while the computer is running.
If this uses USB-C, make sure the charger supports enough wattage and the correct charging standard. Many laptops need around 65 watts or more, and some manufacturers require a specific charger or identification chip. A low-power phone or tablet charger may show as connected while the battery continues draining.
If the charger matches the laptop’s required specifications and the warning continues, try another known-compatible charger. If that doesn’t help, the charging port, battery, or internal charging circuit may need inspection by a repair technician.
A battery health reading of 78% usually means the battery can hold about 78% of the capacity it had when new. That indicates normal wear, but it doesn’t automatically mean the battery is causing this charger warning. The charger’s output and compatibility should be checked first.
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