18v screwdriver, can you charge the battery with a laptop adapter?

Hello, I have a screwdriver for 18v, and the battery is low, and hence my question, can you charge it with a laptop adapter?

The screwdriver is: Einhell Bavaria BAS 18
NI-CD 18V battery

No, because you need a 21V power supply to charge this battery. The rated voltage is 18V or 15 cells 1.2V connected in series. The charging voltage of such a single cell is a minimum of 1.4V, which gives just 21V.

teskot wrote:

you need a power supply with a minimum voltage of 21V

But the power supply is universal and has voltages from 15v to 24v, there are 21, but 20v and 22v.

It will safely charge in the 20V range, although the batteries are not fully charged; in the last phase you can switch to 22V for 10 minutes. Control the battery temperature. The one that burns is usually scrap metal. It can be slightly warm. At the performance of the laptop adapter, charging will take no more than 2 hours. Check the temperature every 10-15 minutes because it is only a partisan Do not treat this solution as a target.

teskot wrote:

It will safely charge at 20V ...

It will not be safe, because in the event of a large discharge, very high current will flow that can damage the batteries. A restriction should be installed.
It's best to build a special charger for example on the popular and cheap MAX712 system.

I should write: SAFER. But apart from everything else, the question still remains: should charging be done directly from the said power supply or through the "base" in which the battery is inserted and the power supply attached to it? In this stand / footer, and really the charger is usually a current limiting resistor. And since the author asks whether it is possible to charge the battery in question with the laptop adapter, the question arises whether the adapter charger of the original charger has been damaged / lost, or the entire charger or in the given screwdriver model can the battery base be integrated with the power supply? Sure, you can build a charger, but since the author asks the above question, it seems to me that for some reason he found himself in a sub-gate situation.

teskot wrote:

if the power supply of the original charger has been damaged / lost

I got a screwdriver from a friend without a charger, it was charged, and I only needed it for a while, and now I need it and it is unloaded.

It's like having a car bulb or other 12V 10-15W handy, turn it on in series with the charger, so as not to smash the battery with a high charging current at the beginning.

teskot wrote:

] turn it on in series with the charger

At what voltage, 20v or 22v?

Invariably, as I wrote - first 20V, let's put 22V after an hour. Keep an eye on the temperature because I don't want to have you and this battery on my conscience.