How to Fix Black & Decker 20V MAX Battery Not Charging

In the world of cordless tools, the Black & Decker 20V MAX Lithium-Ion Battery is a powerhouse. The extended runtime, compatibility with various tools, and the ability to hold a charge for an extended amount of time make this battery a popular choice. But what do you do when your reliable Black & Decker battery refuses to charge? This article will guide you through several methods that could revive your battery and get your tools running again.

Method 1: Manual Charging with a Variable Voltage Power Supply

The first method involves using a variable voltage power supply to manually charge your battery. This process is relatively simple and can often revive a ‘bad battery’ that your charger refuses to acknowledge.

Step-by-Step Instructions

  1. Identify the nominal voltage of your battery. In the case of the Black & Decker 20V MAX Lithium-Ion Battery, this should be around 20V.
  2. Using a variable voltage power supply, manually charge the battery at a voltage slightly higher than its nominal voltage. The idea is to boost the battery’s nominal voltage closer to its desired value.
  3. Continue charging for around 10-15 minutes. This should be enough to bring up the battery to a level where your drill power supplies can recognize and charge it again.

Method 2: Jump-Starting the Battery

Another method involves using a good battery to jump-start the non-charging battery. This method can help revive several batteries, but it must be executed with caution to avoid any potential hazards.

Step-by-Step Instructions

  1. Place a penny in each of the power terminals of the bad battery.
  2. Connect the good battery to the bad battery, ensuring that the positive (+) connects to positive (+) and negative (-) to negative (-).
  3. Make the connection for several seconds only, then immediately place the bad battery on the charger.

Method 3: Testing for Correct Voltage with a Digital Multimeter

This method involves using a digital multimeter to test the battery for the correct voltage. Batteries that do not reach their potential voltage may have a shorted cell, which can cause charger failure.

Step-by-Step Instructions

  1. Charge your battery on a good Firestorm three-hour charger for two minutes. This short charging duration will not damage the charger.
  2. Use a digital multimeter to test the battery’s voltage. It should reach its nominal voltage after the short charge.
  3. If the battery does not reach its potential voltage, it is likely that it has a shorted cell and should not be used.

Check out this helpful post if you’re having trouble with your Ryobi ONE+ 18V Lithium-Ion Battery not charging.

Final Thoughts

A Black & Decker 20V MAX Lithium-Ion Battery not charging can be a significant hurdle in your work. However, with the methods outlined in this article, you might be able to fix the issue yourself. Always remember to use caution and follow manufacturer guidelines when handling batteries. If you are ever in doubt, consult a professional or contact Black & Decker customer service for assistance. With the right approach, your battery can once again power your tools and help you achieve your DIY goals.


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