A Legion Pro 7i Gen 9 that will not charge usually has a power adapter that is too small, a damaged cable or a setting that is holding the battery below its limit, because this gaming laptop draws a great deal of power and is fussy about its supply. Start with the adapter. The Legion Pro 7i uses a large adapter rated for the machine, and a smaller USB-C charger will not charge it while it is in use and may not charge it at all.
The checks in more detail
Check the adapter's output against the label under the laptop, plug it firmly into a wall outlet, not a strip, and look at the light on the adapter or the charging indicator beside the port. A flat battery and a faulty adapter both look like a dead machine, so try another outlet and, if you can borrow one, another adapter of the same rating. Inspect the cable for kinks near the connector and the port for bent pins or debris, and clean it gently with the laptop off. Then look at the software side.
Lenovo Vantage has a conservation mode that limits the charge to about sixty percent to protect the battery, and a laptop that stops at that level is behaving as set; switch it off in Vantage, in the battery section, if you want a full charge. Windows can also show plugged in, not charging if the battery is held in a protective state, and a restart or a power reset clears it. Do the reset: shut the laptop down, unplug everything and hold the power button for about thirty seconds, then connect the adapter alone and start.
Update the BIOS and the embedded controller through Lenovo Vantage or the support site, since battery and charging fixes come with them. In Device Manager, expand Batteries, uninstall the ACPI-compliant control method battery and restart so that Windows reinstalls it. Heavy gaming on an adapter that is slightly too small can drain the battery even while plugged in, so test charging with the laptop idle. If the battery is swollen, if the laptop is hot at the base or the lid will not close flat, stop using it and have it checked. If every step fails, contact Lenovo with the serial number.
Differential
Likely causes of “Lenovo Legion Pro 7i Gen 9 will not charge”, and how to tell them apart
- 1
An adapter that is too small or damaged
What separates it The laptop does not charge or charges only when off
How to confirm Use the supplied adapter and check the cable
- 2
Conservation mode
What separates it Charging stops at a set level
How to confirm Turn it off in Lenovo Vantage
- 3
A stuck power state
What separates it Plugged in, not charging
How to confirm Do a power reset, holding the button for thirty seconds
- 4
Outdated BIOS or controller
What separates it Charging faults recur
How to confirm Update through Lenovo Vantage
- 5
A worn battery or port
What separates it Nothing helps
How to confirm Contact Lenovo with the serial number
Before you touch a setting
Record this first — changing settings destroys the evidence
- The adapter's wattage
- Whether the charging light is on
- The Vantage battery mode
- Whether the battery looks swollen
Try in this order
0 of 6 completedCheck the adapter
ReversibleRating, outlet and cable.
Look at conservation mode
ReversibleIn Lenovo Vantage.
Do a power reset
ReversibleUnplug and hold power for thirty seconds.
Reinstall the battery driver
ReversibleIn Device Manager.
Update BIOS and controller
ReversibleThrough Vantage.
Contact Lenovo
ReversibleIf nothing helps.
Model-specific
What is true of this model and not of its siblings
- Conservation mode
- It limits charge to protect the battery.
- Large adapter
- The laptop needs its supplied adapter.
Stop boundary
When this stops being a self-service repair
- !If the battery is swollen or the base is hot, stop using the laptop
- !If a good adapter and a power reset do not help, contact Lenovo
- !Keep the serial number
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why will my Legion not charge?+
A small adapter, conservation mode or a stuck power state.
What is conservation mode?+
A Vantage setting that stops charging at about sixty percent.
Can I charge from USB-C?+
Not at the power this laptop needs.
How do I do a power reset?+
Unplug and hold the power button for thirty seconds.