Question about Ryobi Two 18V Lithium-Ion Batteries + Lithium-Ion Charger Upgrade Combo Pack

15 Answers

Ryobi 18V lithium battery won't charge

When I try to charge the battery the testing battery light (red) blinks and the battery won't charge.

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  • williamlalle Feb 05, 2009

    Yes, I do have a yellow light with the blinking red light. I bought the charger and battery in July 2008.

  • Jim London
    Jim London May 11, 2010

    Hi, There are three lights on ryobi chargers one red, one green and one yellow. Do you have a yellow on with the blinking red? How old is the battery?

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Hi, Thanks for getting back to me. The yellow and blinking red indicate a defective cell. Since it has lithium cells and is that new any repair to it would be a waste of your time. Ryobi tools purchased in 2008 have a 2 year warranty. I am guessing you probably got it at a home depot and you should return it under the warranty. All new Ryobi tools have a three year warranty. Good Luck! and Thanks for using fixya!

Posted on Feb 05, 2009

  • Thomas Smith Sep 12, 2016

    7/08/2016 I HAVE HAD THIS KIT SINCE, 7/12/2015, BUT I HAVE NOT HAD A CHANCE TO USE IT, DUE TO BAD HEALTH... I BOUGHT IT SO MY BROTHER WOULD HAVE THE TOOLS TO MAKE SOME REPAIRS FOR ME... BUT THEN HE GOT SICK AND COULD NOT MAKE IT UP TO OCALA,FL WHERE I LIVE... HE LIVES IN LEHIGH ACRES,FL.
    SO, I INSTALLED THE BATTERIES IN THE FLASHLIGHT AND THE DRILL FOR STORAGE... I JUST CHECKED THE BATTERY CHARGE IN THE FLASHLIGHT AND IT WAS DOWN BY ONE LIGHT... SO I DECIDED TO TOP OFF BOTH BATTERIES RIGHT NOW... AFTER USING THE FLASH LIGHT FOR ABOUT 10 MINUTES, IT WENT DEAD. I SWITCHED BATTERIES AND DRAINED THAT BATTERY. I TRIED CHARGING BOTH BATTERIES AND THEY WOULD ONLY CHARGE UP TO ONE LIGHT.
    NO LUCK AT ALL, I THINK I HAVE A BAD CHARGER, BECAUSE BOTH BATTERIES WILL NOT CHARGE.
    9-10-2016 I JUST WENT ONLINE TO HOME DEPOT, TO FIND OUT IF OTHER PEOPLE ARE HAVING THE SAME PROBLEM.
    TODAY, 9-11-2016, I CHECKED THE OUTPUT VOLTAGE FROM THE CHARGER WITH MY DIGITAL MULTI TESTER. AND IT WAS AROUND 5.5 VOLTS DC.
    9-12-2016 10:00 AM I JUST RETURNED FROM HOME DEPOT. WITH THE HELP FROM A LADY NAMED KAY, WE FOUND OUT THAT MY CHARGER WAS PROBABLLY OKAY, BECAUSE WE TRIED IT WITH AN 18 VOLT LITHIUM BATTERY THAT THEY HAD THERE AND IT WAS CHARGING IT OK: BOTH RED ON AND GREEN FLASHING.. APPARENTLY, BOTH MY BATTERIES WERE BAD FROM DAY ONE. SHE WAS VERY PLEASANT TO WORK WITH. SHE REPLACED MY BATTERIES WITH TWO NEW ONES. I'M HOME NOW AND CHARGING THE FIRST ONE.
    I GUESS THIS, 18-VOLT DUAL - CHEMISTRY CHARGER, compatible with any 18-Volt ONE+ battery (NiCd or lithium-ion) , WILL NOT OUTPUT 18 VOLTS DC, IF THE BATTERY IS BAD. BOTH BATTERIES TOOK ABOUT 20 MINUTES EACH TO GET TO FULL CHARGE. NOW I WILL LEAVE THE FLASHLIGHT ON FOR AWHILE AND SEE IF I CAN CHARGE THEM BACK UP AGAIN.
    I RAN THE FLASH LIGHT FOR 30 MINUTES, WITH EACH BATTERY, AND THEY BOTH CHARGED UP OKAY. I AM HAPPY NOW...
    I ALSO CHECKED RE-CHARGING BATTERIES ON U TUBE, AND FOUND THAT BATT'S WILL NOT CHARGE, IF THEY ARE UNDER 12 VOLTS.

    RYOBI 6 PIECE KIT MODEL NUMBER: P884 CHARGER MODEL NUMBER: P117 BOTH BATTERIES MODEL NUMBER: P107

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If only the red light is blinking the battery wont charge. Pg 6 of the manual advised the battery will not charge below 32 degrees F. The red light will blink and charging will begin when the battery has warmed up. If you have your batteries and chargers in the garage like I do, take the batteries in the house til they warm up. They will charge normally when warm.

Posted on Dec 11, 2010

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I have 18 volt lithiums and i found if they are too cold they don,t charge .Let the bat warm up first in youre house or vehicle then try it works every time with mine

Posted on Feb 28, 2010

  • Cody Griffin
    Cody Griffin Oct 05, 2015

    I held a hair dryer to mine for about twenty seconds fix it immediately

  • Thomas Smith Sep 12, 2016

    7/08/2016 I HAVE HAD THIS KIT SINCE, 7/12/2015, BUT I HAVE NOT HAD A CHANCE TO USE IT, DUE TO BAD HEALTH... I BOUGHT IT SO MY BROTHER WOULD HAVE THE TOOLS TO MAKE SOME REPAIRS FOR ME... BUT THEN HE GOT SICK AND COULD NOT MAKE IT UP TO OCALA,FL WHERE I LIVE... HE LIVES IN LEHIGH ACRES,FL.
    SO, I INSTALLED THE BATTERIES IN THE FLASHLIGHT AND THE DRILL FOR STORAGE... I JUST CHECKED THE BATTERY CHARGE IN THE FLASHLIGHT AND IT WAS DOWN BY ONE LIGHT... SO I DECIDED TO TOP OFF BOTH BATTERIES RIGHT NOW... AFTER USING THE FLASH LIGHT FOR ABOUT 10 MINUTES, IT WENT DEAD. I SWITCHED BATTERIES AND DRAINED THAT BATTERY. I TRIED CHARGING BOTH BATTERIES AND THEY WOULD ONLY CHARGE UP TO ONE LIGHT.
    NO LUCK AT ALL, I THINK I HAVE A BAD CHARGER, BECAUSE BOTH BATTERIES WILL NOT CHARGE.
    9-10-2016 I JUST WENT ONLINE TO HOME DEPOT, TO FIND OUT IF OTHER PEOPLE ARE HAVING THE SAME PROBLEM.
    TODAY, 9-11-2016, I CHECKED THE OUTPUT VOLTAGE FROM THE CHARGER WITH MY DIGITAL MULTI TESTER. AND IT WAS AROUND 5.5 VOLTS DC.
    9-12-2016 10:00 AM I JUST RETURNED FROM HOME DEPOT. WITH THE HELP FROM A LADY NAMED KAY, WE FOUND OUT THAT MY CHARGER WAS PROBABLLY OKAY, BECAUSE WE TRIED IT WITH AN 18 VOLT LITHIUM BATTERY THAT THEY HAD THERE AND IT WAS CHARGING IT OK: BOTH RED ON AND GREEN FLASHING.. APPARENTLY, BOTH MY BATTERIES WERE BAD FROM DAY ONE. SHE WAS VERY PLEASANT TO WORK WITH. SHE REPLACED MY BATTERIES WITH TWO NEW ONES. I'M HOME NOW AND CHARGING THE FIRST ONE.
    I GUESS THIS, 18-VOLT DUAL - CHEMISTRY CHARGER, compatible with any 18-Volt ONE+ battery (NiCd or lithium-ion) , WILL NOT OUTPUT 18 VOLTS DC, IF THE BATTERY IS BAD. BOTH BATTERIES TOOK ABOUT 20 MINUTES EACH TO GET TO FULL CHARGE. NOW I WILL LEAVE THE FLASHLIGHT ON FOR AWHILE AND SEE IF I CAN CHARGE THEM BACK UP AGAIN.
    I RAN THE FLASH LIGHT FOR 30 MINUTES, WITH EACH BATTERY, AND THEY BOTH CHARGED UP OKAY. I AM HAPPY NOW...
    I ALSO CHECKED RE-CHARGING BATTERIES ON U TUBE, AND FOUND THAT BATT'S WILL NOT CHARGE, IF THEY ARE UNDER 12 VOLTS.

    RYOBI 6 PIECE KIT MODEL NUMBER: P884 CHARGER MODEL NUMBER: P117 BOTH BATTERIES MODEL NUMBER: P107

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Sometimes the contacts dont contact - try pulling the metal tabs inside the charger out a bit to correct this. Fixed my problem to these good batteries

Posted on Mar 18, 2010

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First check voltage on battery. Mine was showing .01.
First remove casing from battery pack. Check voltage coming out of both ends of batteries positive negative sides not the part that sticks up and goes into charger, my voltage was about 5. Then take a 12 volt car battery charger and touch to positive and negative on batteries for 30 seconds. Check voltage, it should now be about 12 volts. Reesemble battery pack and charge normally

Posted on Jun 02, 2016

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I had the same problem, light flashing red signalling 'testing', and would never go into charge mode. It did this on two separate batteries, one discharged and one not. I did not know about the temperature range requirement of the batteries and charger.

I thought that the charger was defective. I played with it and found that the following procedure forced the charger to charge the batteries:

1. With the charger plugged in and the battery in the charger (i.e. red light is flashing).
2. Unplug the charger and watch the flashing red L.E.D. drain the remaining electricity from the charger.
3. At the moment that the L.E.D. goes solid, and just before all the electricity is drained from the charger (about 1.5 seconds), plug the charger back in.

I found that the charger starts charging the battery immediately. It might be defeating the temperature checking by doing this so this is definitely a last resort.

Posted on Sep 04, 2015

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Where are all you people when i have other problems with my random tools?(just wanted to say that because i was extremely impressed with random knowledge i found on a random thread....and i'm randomly writing to....anyway...good job internets you did your job for once.

Posted on Jun 03, 2014

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The 2 air holes on the lithium batterys at the bottom can be used blow air into them a few times and they will charge

Posted on Feb 14, 2011

  • 1 more comment 
  • eatme754 Jun 04, 2011

    Idiot

  • wallygatorca Jan 11, 2012

    The idiot is eatme754.

    The air holes are there for the battery to vent. Downside is, these vents can also allow moisture to get in and prevent contacts from letting the battery charge and causing the "defective" display on the charger.

    I work on pool and spa equipment and I had dropped my batteries in a small puddle of water where I was working, both went dead immediately and both showed "defective" on the charger even after drying them out for a few days.

    I tried AJenkins123 method of blowing air in the vent holes and the batteries are back to working perfectly.

    Thanks AJenkins!

  • Anonymous Jun 13, 2016

    There are no "vent holes"!

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Also make sure the battery is fully seated in the charger. On mine if it doesn't click then it's not seated fully and will flash "defective".

Posted on Jan 01, 2017

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7/08/2016 I HAVE HAD THIS KIT SINCE, 7/12/2015, BUT I HAVE NOT HAD A CHANCE TO USE IT, DUE TO BAD HEALTH... I BOUGHT IT SO MY BROTHER WOULD HAVE THE TOOLS TO MAKE SOME REPAIRS FOR ME... BUT THEN HE GOT SICK AND COULD NOT MAKE IT UP TO OCALA,FL WHERE I LIVE... HE LIVES IN LEHIGH ACRES,FL.
SO, I INSTALLED THE BATTERIES IN THE FLASHLIGHT AND THE DRILL FOR STORAGE... I JUST CHECKED THE BATTERY CHARGE IN THE FLASHLIGHT AND IT WAS DOWN BY ONE LIGHT... SO I DECIDED TO TOP OFF BOTH BATTERIES RIGHT NOW... AFTER USING THE FLASH LIGHT FOR ABOUT 10 MINUTES, IT WENT DEAD. I SWITCHED BATTERIES AND DRAINED THAT BATTERY. I TRIED CHARGING BOTH BATTERIES AND THEY WOULD ONLY CHARGE UP TO ONE LIGHT.
NO LUCK AT ALL, I THINK I HAVE A BAD CHARGER, BECAUSE BOTH BATTERIES WILL NOT CHARGE.
9-10-2016 I JUST WENT ONLINE TO HOME DEPOT, TO FIND OUT IF OTHER PEOPLE ARE HAVING THE SAME PROBLEM.
TODAY, 9-11-2016, I CHECKED THE OUTPUT VOLTAGE FROM THE CHARGER WITH MY DIGITAL MULTI TESTER. AND IT WAS AROUND 5.5 VOLTS DC.
9-12-2016 10:00 AM I JUST RETURNED FROM HOME DEPOT. WITH THE HELP FROM A LADY NAMED KAY, WE FOUND OUT THAT MY CHARGER WAS PROBABLLY OKAY, BECAUSE WE TRIED IT WITH AN 18 VOLT LITHIUM BATTERY THAT THEY HAD THERE AND IT WAS CHARGING IT OK: BOTH RED ON AND GREEN FLASHING.. APPARENTLY, BOTH MY BATTERIES WERE BAD FROM DAY ONE. SHE WAS VERY PLEASANT TO WORK WITH. SHE REPLACED MY BATTERIES WITH TWO NEW ONES. I'M HOME NOW AND CHARGING THE FIRST ONE.
I GUESS THIS, 18-VOLT DUAL - CHEMISTRY CHARGER, compatible with any 18-Volt ONE+ battery (NiCd or lithium-ion) , WILL NOT OUTPUT 18 VOLTS DC, IF THE BATTERY IS BAD. BOTH BATTERIES TOOK ABOUT 20 MINUTES EACH TO GET TO FULL CHARGE. NOW I WILL LEAVE THE FLASHLIGHT ON FOR AWHILE AND SEE IF I CAN CHARGE THEM BACK UP AGAIN.
I RAN THE FLASH LIGHT FOR 30 MINUTES, WITH EACH BATTERY, AND THEY BOTH CHARGED UP OKAY. I AM HAPPY NOW...
I ALSO CHECKED RE-CHARGING BATTERIES ON U TUBE, AND FOUND THAT BATT'S WILL NOT CHARGE, IF THEY ARE UNDER 12 VOLTS.

RYOBI 6 PIECE KIT MODEL NUMBER: P884 CHARGER MODEL NUMBER: P117 BOTH BATTERIES MODEL NUMBER: P107

Posted on Sep 12, 2016

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Much batteries made of different brands have a special circuit that have a deep discharge protection, if a new battery is for a 3 years was not selled then there is not enough dc on it and the charger don't accept the battery no more, Be aware the batteries are not allways defect !!! but there are more special service dealers they have special CADEX service tool chargers for it to boost and on a safe way this batteries

Universal Conditioning Chargers

Posted on Jul 01, 2016

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Just had the exact same problem. After reading the threads. There is actually a small tab on the Tom of the battery and the charger that could be the problem also. My was bent down and not touching the battery contact. Here is a pic

Unless those two match up the battery will not leave the testing cycle.
Ryobi 18V lithium battery won't charge - 6_26_2016_10_35_26_pm.jpg6_26_2016_10_35_27_pm.jpg

Posted on Jun 26, 2016

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I was having the same problem when I found this thread. It is 90 degrees out so I knew temperature wasn't the problem. I lifted the contacts but also cleaned the contacts on the battery itself, and now it's finally charging.

Posted on Aug 08, 2015

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I use 10 LI-Ion 18V Ryobi batteries to power my electric assist bicycle. Works well, but last year I inadvertently shorted out one of the batteries and it would no longer take a charge. I thought the battery was toast until I followed a procedure to dismantle the battery that was recently posted on FIXIT website: (http://www.ifixit.com/Guide/Cell+Re-balance+of+Ryobi+One++18V+Li-ion+Battery+(130501002)/13286/1). Among the 5 pairs of SANYO 18650 cells, I found that there was a voltage imbalance of slightly more than 0.1V among the cells. I carefully (and safely) charged the lower voltages cells to reduce the cell imbalance to about 0.01V. After reassembly, the battery appears work fine, just like new.

Posted on May 09, 2013

  • theoisle
    theoisle Nov 11, 2014

    I would say that you got lucky. I have taken apart plenty of these packs and most often they will have one or more cells bad that cannot be charged. In situations where I have connected a good cell in parallel with a bad cell I will notice the bad cell heating up, which is a good reason not to leave them and forget them.

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I had the same problem stuck on 'flashing red' (testing phase) with 3 different batteries and 2 chargers. Of course it's the middle of winter and the batteries have been in my garage for months when the temps have barely crept above 30 degrees. Unfortunately, I needed a battery ASAP. I brought them in the house, removed the batteries from the chargers, got out a hair dryer and warmed up the batteries for about a minute each. I popped a battery on each charger and both immediately began charging. Whether that's recommended, it got me the results I needed.

Posted on Feb 28, 2013

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