Notebook with 10.8 V nominal voltage, with 12 V charge?

I've got an older, well-preserved notebook from a friend that unfortunately has no power adapter, a Lenovo Thinkpad T430. The battery has a rated voltage of 10.8 volts.

I have a universal car charger for laptops, which can be adjusted from 12 to 24 volts and also brings the right plug for the Thinkpad.

Is it possible to charge a battery with 12 Volt which has a lower nominal voltage or is this a permanent risk?

Probably you go, usually you still have a switching power supply that converts a voltage to the required. That could compensate for that. But I would not like to risk an unknown device.

3.6 volts per cell probably… Lithium cobalt dioxide (LiCoO2)
→ rated voltage of 10.8 volts.
Working range of the battery should be between 9 (battery empty) and 12.6 V.
With a older (used) battery you will however the full capacity
of 12.6 V not quite reach.

Conclusion: you can use your charger (12V), but you will probably not reach the maximum charge with your old battery (capacity).
In my opinion, 13-15 V charging voltage would be better.

PS: The nominal voltage is always lower than the charging voltage. Conclusion: no risk.

You can use such a charger with caution if you avoid being fully charged.

The big question is whether the end-of-charge voltage is precisely monitored.

It is advisable to install a new battery. The old one will not be good anyway.

There remains a risk.