bosch battery not charging

Bosch Battery Not Charging – 3 Quick Fixes!

Power tool industry giant Bosch offers a range of high-quality and reliable products that are well-known and reputable. The Bosch 12V and 18V batteries are the most luxurious and affordable tools for DIYers and professionals. However, although Bosch tools are known for their reliability, users may occasionally encounter issues with their battery charging.

It might be frustrating when you’re working on important tasks and need to complete them as soon as possible. Fortunately, you can resolve the issue quickly before you call a technician or buy a new one.

We have done the research and come up with amazing quick fixes that will help you out in this critical situation. Let’s go over three solutions to fix Bosch battery not charging problems, helping you get your batteries holding a charge and working again quickly.

So, let’s get started!

Bosch Battery Not Charging – Reasons

Bosch 12V and 18V batteries may not charge due to several factors, such as a faulty charger, a damaged battery, or an issue with the charging port. Moreover, a faulty electrical outlet or faulty power source could also affect the charge of your Bosch battery. Many minor problems can be repaired quickly without needing more complicated repairs. However, a new battery may occasionally be needed when encountering more serious problems.

Troubleshooting – Bosch Battery Charger Lights

Bosch battery chargers feature multiple lights of varying colors that indicate different statuses. Having a good understanding of the color of your Bosch battery charger’s lights can make it easier for you to diagnose and troubleshoot any issues you may be experiencing.

Green Light

An illuminated green power light indicates that the charger is powered on. The solid green light indicates that the charging has been completed.

Yellow Light

In most chargers, yellow is the color of the charging light that indicates the battery is charging.

Red Light

The red light is considered the charger’s error light. In this case, either the battery or the charger may be malfunctioning. Red flashing lights are sometimes indicative of an overheated or undercharged battery. A solid red light may indicate damaged battery cells or a faulty charging port.

3 Quick Fixes of Bosch Battery Not Charging

Here are a few quick fixes you can try before going to a professional if you are experiencing charging problems with your Bosch 12V or 18V battery. Listed below are three potential solutions:

Fix # 1: Remove Dust/Debris & corrosion

It is possible for Bosch 12V and 18V batteries and chargers to malfunction as a result of dust and corrosion buildup. However, you can clean them by following these steps:

  1. You may need to clean the contacts on the battery and on the charging contacts by repeatedly inserting and removing the battery.
  2. For safety reasons, make sure the battery and charger are disconnected before starting the cleaning process.
  3. Using a soft-bristled brush or dry cloth, gently clean any dust or debris that has accumulated on the battery and charger.
  4. To clean battery and charger metal contacts, dampen a clean cloth with rubbing alcohol and rub gently. Ensure the battery terminals and charging port does not get wet, to avoid further damage.
  5. The battery and charger should be completely dry before you connect them to a power outlet or attempt to charge them.

Pro Tip: Be sure to avoid using any abrasive materials or liquids, as these can damage the surface or internal components of the battery or charger. Regular cleaning can help prevent issues and ensure that your tools continue to work reliably.

Fix # 2: Provide Appropriate Temperature

The following steps can help you resolve the problem if the temperature of your Bosch 12V or 18V battery hinders charging:

  1. The battery should be charged only when it has reached the appropriate temperature range, so make sure it is not too hot or too cold before charging it again.
  2. It is better to move the battery to a cooler location if it is too hot. You can warm up a cold battery by moving it to a warmer place.
  3. Charging should be conducted in a temperature range that is within the battery’s recommended range. In order to ensure the durability of Bosch batteries, they should be stored between 0°C and 45°C (32°F and 113°F).
  4. When the battery continues to fall outside its charging range, it is possible that the charger is the problem instead of the battery. To determine if the problem persists, use a different charger or test it with a different battery.

Pro Tip: Your tools will last longer if you charge them within the correct temperature range.

Fix # 3: Power Juice from Other Battery

To convert the power juice from the other battery to Bosch dead battery, you can follow these simple steps:

  1. You need one fully charged battery to convert the power juice from a fully charged battery to a dead one.
  2. The two batteries should be placed side by side.
  3. In order to connect the two batteries, take two short insulated wires and align their polarities.
  4. Identify the positive and negative terminals of each battery.
  5. Positives should be attached to positives, and negatives should be attached to negatives.
  6. As a result, you are able to transfer power from the live battery to the dead one.

Not Fixed Yet (How to Reset Bosch Battery)

If your Bosch drill battery is not holding charge even after applying all methods to fix the problem. Try to reset the battery to fix the issue. Hopefully, it will help you start holding the charge.

Here is how you can reset a Bosch 12v or 18v battery:

  1. The battery should be completely discharged by using it to the point where it is completely empty.
  2. Make sure the tool’s battery is at room temperature before removing it from the device.
  3. Connect the battery to the charger and turn it off before inserting the battery.
  4. You must hold the on/off button on the charger for at least 10 seconds in order to turn it on.
  5. As soon as the charger indicates the battery is charging, release the button.
  6. The battery must be completely charged before use.

After resetting the battery, if it still doesn’t function properly, you should think about replacing it.

Frequently Asked Questions (FAQs)

1- How do you reset a Bosch battery?

You can reset a Bosch battery by discharging it fully, placing it in the charger, then pressing and holding the “on/off” button for at least 10 seconds and letting it charge entirely.

2- How do you fix a lithium battery that won’t charge?

In order to fix a lithium battery that won’t charge, follow these steps:

  • Make sure the battery and charger are compatible and turned on.
  • Clean the accumulated dust and corrosion from the metal contacts of the battery as well as the charger.
  • The battery can be reset by unplugging it from the charger, letting it cool down, and reinserting it.
  • In the event the battery cannot be charged, try charging it on another charger or with another power outlet.
  • There is a possibility that the battery is defective and needs to be replaced if none of these steps work.

3- Can Bosch batteries be repaired?

Certain Bosch batteries can be repaired if the damage is minor or moderate. The battery may need to be replaced if it is physically damaged, or attempted repair could void the warranty. If you need a battery repaired or replaced, you should take it to a qualified technician or an authorized service center of the manufacturer.

4- How long will a Bosch battery last?

Bosch gives 2 year of guarantee for its batteries, but if you use them with extra care and according to the manufacturer’s recommendations, they can work well for up to 10 years.

5- What does a flashing red light mean on a Bosch battery charger?

The red flashing light indicates an error in the charging that is due to the malfunctioning of the charger and the battery.


Throughout this guide, we have explained the causes and possible solutions for the Bosch battery not charging properly. Try these methods if you want to restore your Bosch battery’s performance before consulting a technician. Unlike some other fixes, these don’t require technical knowledge to apply. All you have to do is read them carefully and apply them to the battery using the described steps sequentially. It may save you to spend your hard-earned money to buy a new one.

1 thought on “Bosch Battery Not Charging – 3 Quick Fixes!”

  1. Having used Bosch products over many years unfortunately the batteries today seem to be their biggest quality issue. The small 12V batteries are the worst which seem to be unable to hold a continuous charge and go into a DEAD mode and unable to restart. I’ve bought my daughter a Drill/ Driver set and myself a planer in the past 2 yrs all having the same issues. Thank heavens I still have the 10.8V batteries which still fully function after 10-15yrs of use. No it’s not the power source or anything else, it’s just poor quality batteries.


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