[Solved] Parkside Screwdriver Battery Issues: 18V Not Charging, LED Blinks, No Power Detected

Hello.
One day the screwdriver stopped working. I put the battery in the charger and does not detect anything. The meter on the battery shows the total charge. When you try to turn on the screwdriver, only the diode from the screwdriver lightly blinks (from the backlight of the work place) and that's it. It seems to me that the battery has no power, and how much the meter has 18v or charged. Measured without load.
greetings

It may try to charge the batteries with some known load and see if the appropriate current appears. I think that 2 bulbs for 21W car will be ok for this experiment.

The charging voltage should be approx. 5% higher than the nominal value of the battery. If it is smaller or equal the loading will be incomplete although the indicator will show full

I unscrew the battery, connected it to the screwdriver and to the voltmeter. When the 18v screwdriver is turned off, when it is turned on, the current drops to 0. In the battery casing a piece of the casing is burned out (this way it looks like something would be heating up). Below photos.

it looks like a bad injection mold from this part of the battery housing. I suggest you give away for guarantees (ps you can not take apart the equipment in PL because it's probably an offense like no longer a crime).

It's probably out of warranty, I think. I need to see. And the badly cast or burnt one is above these elements.

Hello.

And you tried to measure the voltage on individual links?
Maybe some link is damaged and the protection works?

Hello.
The problem was solved, namely all links were good. The battery somehow discharged below the critical point to such an extent that the charger did not see it. The screwdriver itself switched on the safety mode and turned off due to too low voltage. I plugged a small AA battery into the battery and connected it via the charger (this way the battery current jumped to 19v). The charger detects the battery and recharges it. The battery has come back to life. I close the subject.

At the request of the author of the topic - unlock.

I asked for the topic to be unlocked to add photos if anyone needed.

The puzzling thing about this Parkside set is that since the screwdriver has a protection and turns off when the battery voltage is low, it does it at the wrong time, since the charger is unable to see the battery. Basically, the problem here is the charger, which, for senseless reasons, does not see it at all at low battery voltage.

I couldn't save my colleague's method above, i.e. I plugged the external battery into the circuit, and exactly put the wires inside the battery plug. Since the charger was supposed to detect the voltage, it supposedly should start, especially since my external battery was a 16340 and had a voltage of 4.1V, which is much more than 1.5V with AA. But after connecting the charger turned off the red diode, something was ticking and then the red one turned on again.

I managed a different way. For this purpose, you need either an ordinary car rectifier that will be able to provide a stronger current, or a modern car charger + some gel battery to start it at all, because it does not provide any voltage by itself. Fortunately, I had a charger + some old gel battery with a voltage of 1V ... So I connected the gel to the car charger and connected the wires from the charger's battery plug. The charging voltage fluctuated between 10-11V. At the beginning, after a while, the green diode turned on and after disconnecting it did not want to go out ... On the second attempt, I combined with shorter times of connecting the wires to the gel charger and it worked, the charger surprised and the green diode began to flash, i.e. the battery charging began.
Pictures below.
Information yet. The cells are hopeless, unbranded, capacity 1300 ... So if someone wants to play with detaching the plates and re-soldering the cells, you can buy 5 pcs for PLN 20 for PLN 100, the best cells on the market with a capacity of 3500mAh. In this way, we would have a battery 3 times as good as the original.