There are quite a few examples on the Internet of how you can restore a dead screwdriver battery without even opening it. I just have two batteries lying around that cannot be charged, even if they charge all night.
The recovery method that I will test is suitable for batteries that are no longer charged by a standard device and for those that are fully charged, but their capacity is extremely small for long-term operation of the screwdriver.
The idea itself
The idea is to apply a high current to the battery for a short period of time. After this, as the authors of such ideas promise, the battery almost always returns to work and lives for a long time.
I'm trying to charge my batteries:
The red-green indicator on the charger flashes - this means that the charger renders the battery completely unsuitable for charging. The voltage on it is practically zero.
Both of my batteries have this defect.
Well, let's try to use the recovery method.
Will need
- Powerful current source capable of delivering 50 A.
I will use a DC welder, as will most of those who recommend this method.
My experience in restoring NiCd batteries
So, I take the first battery.
I set the minimum current on the welding machine, in my case - 45 A. And I connect plus to plus, minus to minus.
All this for a couple of seconds. It's okay if a spark jumps at the moment of connection.
You can repeat this procedure several times. Next, I insert it into the charger and try to charge it.
A miracle did not happen: the indicator also blinks from red to green. I waited a little just in case - everything was the same, nothing had changed.
Okay, let's move on to the second battery. We will also shock it for a short time.
But with the second battery there is already a result:
The indicator started to glow red, which means charging has started.
Conclusion
So, is the idea working? Not really. Although the second battery began to charge, after 10-15 minutes it reached full charge, as the charger showed. As a result, the screwdriver could be used for a couple of minutes. In general, the battery capacity tends to zero.
The result is this: I can’t say that this method is 100% ineffective, but it didn’t help my batteries. Maybe they're too old... Maybe they've been sitting idle for too long....
In any case, be sure to try this method! It won't get any worse, but suddenly you will be able to restore and bring your screwdriver back to life. If you have already used it, write your result in the comments.
