Why is my MacBook plugged in but still draining?
A power connection does not guarantee that enough energy is reaching the Mac to cover its current workload. If demand is higher than the available input, the battery can supply the difference even while the plug icon is visible.
What the reading means
Anode labels this state only when macOS reports external power and the battery is still losing net power. A reading such as -8 W means the battery is contributing roughly eight watts at that moment; it does not mean the adapter itself is delivering negative power. Short spikes can be normal, so compare several readings before drawing a conclusion.
Check workload before replacing hardware
Pause a game, video export, virtual machine or other demanding task and watch whether net battery power moves towards zero. Apple notes that a Mac can drain when a high-performance workload uses more power than the connected source provides. Displays, hubs and brightness can add demand too.
Then isolate the charging path
Connect the recommended adapter directly, try the original charging cable, inspect ports and test another known-good outlet. Apple recommends a charging solution that meets the minimum wattage for the model. Anode shows the adapter rating when macOS exposes it, but a rating is not a guarantee of power currently reaching the battery.
Start with the current macOS message
The manual charging-status checklist helps separate a charging hold or limit from observations that need attention. It does not read your battery or diagnose hardware.
Reviewed 7 September 2026 against primary sources: