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Fixing your Black & Decker 18V charger

I have a Black & Decker battery charger (S100235-02 14.4V Ni-Cd battery Charger) that doesn’t want to charge anymore, just opened it an found the R2 resistor burned up, I can’t recognize the resistor because the coating is burnt. Here how it look like:


I still don’t know what blew the resistor… If it was a failure of another device in the charger or battery, then just replacing the resistor won’t help. I am still trying to because this kind of resistor is cheap and easy to replace.

Thanks to Google reverse image search, I’ve found one image with the resistor still in place AND readable Smile


Credit to


According to the chart above, I need a new 21 Ohms 10% 2 Watt resistor, a quick check 18 volt / 21 Ohms lead to 0.857A for charging. Output of charger is rated at 18V/1A. Next step is to solder the new resistor…

Here is also a forum thread I’ve found.

About The Author

Cédric Walter

I worked with various Insurances companies across Switzerland on online applications handling billion premium volumes. I love to continuously spark my creativity in many different and challenging open-source projects fueled by my great passion for innovation and blockchain technology.In my technical role as a senior software engineer and Blockchain consultant, I help to define and implement innovative solutions in the scope of both blockchain and traditional products, solutions, and services. I can support the full spectrum of software development activities, starting from analyzing ideas and business cases and up to the production deployment of the solutions.I'm the Founder and CEO of Disruptr GmbH.