Ryobi 18V lithium battery won't charge

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!

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.

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

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

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

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

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".

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.

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.

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Let me explain....if you were to take apart any of these battery packs, you would find, normally, 6 individual 18650 cells, wired to provide the necessary volts....when these cells are allowed to discharge below a certain point, they will no longer register enough voltage, as a pack, to energize the circuitry and allow charging to begin. You need to "shock" the pack with another DC power source that is greater than the voltage of the pack when fully charged...an 18V pack might require 30 to 36 volts DC. Shocking occurs by touching +to + and - to -, good source to bad battery...hold for 2 seconds and release...you will raise the volts of the pack back up to a point where the charger will recognize the pack and charge it.

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http://softvela.com/microsoft-windows-10-gamer-edition-full-iso-download/

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The battery is bad

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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

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

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.

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.

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.