How To Fix Ryobi 18v Lithium Battery – Tutorial 2022

Looking to fix a Ryobi 18v Lithium Battery? Well you’re in the right place!

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If your Ryobi 18v Lithium Battery (Ryobi p190 battery) won’t take a charge, you should know that all Ryobi equipment and batteries come with a 3 year warranty. If your Ryobi 18v Lithium Battery is less than three years old, you are in luck and should make a call to your designated place of purchase or call Ryobi’s customer service US number.


The RYOBI 18V ONE+ System with the Ryobi 18v Lithium Battery is obviously a great representation of the type of quality products Ryobi continues to produce. With 3X more runtime than the previous model, the Ryobi 18v Lithium Battery contributes to an improved user experience. Although, if the battery is not working the way that it should, we will get to the bottom of it.

What To Look For

Ryobi 18v Lithium Battery Check Lights

When you plug the Ryobi 18v Lithium Battery in to charge it should start to flash red on the front and eventually turn into a solid green. Once the light is green, this means that the battery is charge and ready to use.

You can tell if your Ryobi 18v Lithium Battery is broken by the state of the light. If you plug in your battery and it flashes red and continues to flash red without ever turning green and eventually stop flashing all together, definitely points towards your battery being broken. The reason this can happen is due to the charge on the Ryobi 18v Lithium Batteries get so low that the circuit board keeps the battery from being able to charge properly.

Quick Fix For the Ryobi 18v Lithium Battery

You should know before making any adjustments to your Ryobi 18v Lithium Battery that it will not be covered under warranty once you have opened it up. If you believe the battery can still be covered under warranty, don’t risk losing that due to attempting to fix it yourself. That being said, we can move on to fixing your Ryobi 18v Lithium Battery:

Required Tools To Fix Your Ryobi 18v Lithium Battery

  • Multimeter
  • 3 Insulated Alligator Clips (Red = Hot/Positive) (Black = Negative) (Yellow = Neutral)
  • Ryobi Charger
  • Working Ryobi 18v Lithium Battery (optional)
  • Toothpick/Small Pick/Hook
  • Flat Surface
  • Torx Security Bit t10/Screwdriver
Required Tools On Amazon

Taking Apart The Ryobi 18v Lithium Battery

Place both batteries on flat surface next to each other. First point your toothpick/mini hook tool into the center of the security screws, pull them all out and place them somewhere safe aside. Once put aside, place your multimeter on the flat surface next to the batteries. Now using the multimeter you should be able to read a few volts through the battery just to make sure its going to charge.

Ryobi 18v Lithium Battery – Multimeter Check

On the broken Ryobi 18v Lithium Battery touch the wires on each side and check the multimeter for the digits. If it only reads around 0.01 volts then this confirms that the battery is not working properly. Next use the same multimeter to check the volts on the working, fully charged Ryobi battery and the multimeter should display around 18-19 volts. This is how you can test and check to see if a battery will take a charge or not due to the charge already being too low. The charge on the Ryobi 18v Lithium Battery needs to be at least around 8-9 volts before it starts to charge properly.

Open Up Your Ryobi One+ 18V Lithium Battery

Using the Torx Security Bit t10, take all 5 screws out of the Ryobi 18v Lithium Battery (4 around the side and one at the top). Once the screws are taken out, you can open the battery right in half allowing you access inside the casing. Take the side of the casing you just took the screws out of off the top of the battery and place it to the side (keep in mind to place it facing the same way it was on the battery. Where the 5th screw on the top was displays the positive and negative sides of the battery. Ensure they stay on the same side once placed to the side so you can remember).

Now using the your fitted Ryobi Charger (you can also identify the positive & negative sides on the top of the charger) and the 3 Insulated Alligator Clips (Red = Hot/Positive) (Black = Negative) (Yellow = Neutral), attach each of the clips to one of the battery legs.


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  1. Connect all the 3 wires to the correct positive, negative and neutral legs of the battery.

2. Ensure that all the wires are in the correct positions!

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Ryobi One+ 18V Lithium Battery img3

3. Connect the red wire to the referenced position on the battery in this image

4. Hold the yellow and the black wires on the metal part (right above the Ryobi Logo. In between the two red pieces of plastic.

Hold these two clips on the displayed metal part of the battery for 10 seconds then take it off. Wait 1 second and then put the two wires back onto the metal.

Repeat this process about 3-4 times.

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Now using your multimeter, test the batter again and if you followed the steps correctly, the battery should be displaying an improvement in relation to the last time you tested it. Once you have tested the Ryobi 18v Lithium Battery on the multimeter, you can use the wire clips to charge the battery a couple more times before putting the case back on.

Once the case if correctly back on the battery and the screws are screwed back in, your Ryobi 18v Lithium Battery should be ready to charge from the charger again! Amazing right? We just completely fixed your battery!


If your battery is still having issues, you can refer to the referenced video below for an in depth tutorial of how to complete this task. Overall, the Ryobi 18v Lithium Battery is a great addition for anyone and once you know a couple more tips and tricks such as what you learnt today, you will be a master of the batteries!

Looking For A Ryobi 18v Lithium Battery?

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