A Lenovo battery is “bad” when it becomes unreliable: big percentage jumps, sudden shutdowns, or charging problems that repeat. Before you replace it, rule out Lenovo-specific settings and charger wattage issues.
Common signs your Lenovo battery is failing
- Runtime dropped dramatically compared to earlier months/years.
- Battery percentage jumps (e.g., 60% → 25% quickly).
- Laptop shuts down at 20–40% (voltage drops under load).
- Very slow charging or “plugged in, not charging.”
- Battery not detected or disappears intermittently.
Lenovo-specific false alarms
- Vantage charge limit (often 60–80%): conservation mode is normal.
- USB-C charger too weak: under load, it may not keep up, making it look like a battery problem.
- ThinkPad dual batteries (some models): one battery can be weak while the other is fine.
Confirm with Windows Battery Report
powercfg /batteryreportCompare Design Capacity vs Full Charge Capacity. A big drop plus real-world issues usually means replacement is the right move.
Choose the correct replacement battery
- Match the battery’s FRU/Part Number (most reliable).
- Verify V, Wh, and the connector.
Need parts?