Ryobi 40V 2.6A battery. When I put it on the charger the charger blinks green for about 10 minutes and then goes to solid green. However, after 5 minutes of use my Ryobi trimmer dies. I repeat the process with the battery and get the exact same results. No charge level lights illuminate when I push the button on the battery either. I know blinking green indicates “charging” and solid green indicates “charged”. I cannot for the life of me figure out why the charger indicates a full charge while the battery itself indicates nothing. The charger is not the issue as everything works fine with a different battery and the trimmer is not the issue as it works fine with the second battery.

The batteries have gone into Sleep Mode. The battery voltage is too low to be registered by the charger. There are tricks to put some power back into the cells.

https://www.essentialhomeandgarden.com/ryobi-40v-battery-problems/

https://www.google.com/search?q=40v+cordless+mower+batteries+too+low+to+charge

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The batter is faulty , perhaps one of the cells has shorted out .

Completely dead batteries may cause the charger to not see any load and it wont charge them. The way around this is to put the battery on the charger with the charger unplugged. Then plug in the charger and check the lights. Keep unplugging and plugging in the charger till it catches up and stays on.

either battery is charged or battery is bad.
All chargers act different so I can't tell you. Try measuring the battery voltage with a meter. I assume you do not have another battery to try.
If the voltage is about 40V then the device might be bad. If it is much less (discharged) then the charger might be bad.
But the battery may also be bad.
A high internal resistance on the battery might cause the charger to think the battery is charged because it isn't drawing much current

My Ryobi 18V One+ charger blinks green while it's charging. When the battery is fully charged, the LED goes to a solid green. However, one battery recently had a faulty cell. After several hours on the charger, the green and red LEDs both were blinking. That indicated that the battery failed late in the charging sequence. It didn't fail the initial testing by the charger. The other battery I charged that day charged fine.

The extended capacity batteries can take 12 hours to charge in my experience. The regular batteries take less time. The charge time will depend on the battery chemistry(The older NiCd batteries take longer to charge then the Lithium batteries.)

I hope this helps. Assuming you aren't dealing with a cold or hot battery or charging environment, if you have any suspicion about a faulty battery, replace it.

Cindy Wells
(Note: I have a 12V drill as well. Those batteries takes longer to charge for the same relative capacity than the 18V NiCd batteries.)

How long have you left battery on charger? It will take about 3 1/2 hrs to fully charge. t is probably not a good idea to leave the battery in the charger for long periods of time though, so once it is fully charged put it back in the drill. When fully charged the green led will turn solid. This link will have more info on charger and battery.
http://powertool.manualsonline.com/manuals/mfg/ryobi/130155001.html?p=2 C

Yes, the green light flashes until the battery is fully charged on Ryobi chargers. This will change to a solid green light when the battery is fully charged until the charger goes to a power-saving mode. Not all of the Ryobi chargers have a power-saving mode. However, for those that do, the green led will dim over time and then brighten and dim slowly again in this mode.

My Ryobi charger, model P113, actually has a key for the LEDs on the unit on the left of the battery port. The manual for this charger is here: https://manuals.ttigroupna.com/system/files/5495/original/P113_192_trilingual.pdf?2011 . Ryobi has many of their manuals on their site. Look up your charger/tool here: https://www.ryobitools.com/power-tools/support/manuals , Home Depot's web site also has many of these manuals on the product site for the tools that they sell.

I hope this helps.

Cindy Wells

Battery is weak. Those lights are really useless...more a marketing gimmick. It almost sounds like it developed a memory...this happens when certain types of batteries are not fully discharged before being placed on the charger. Replace the battery and make sure to follow charging directions for that particular type of battery

check output on transformer, 2 check pcb ,could be a regulator

sound to me like you have a bad battery, a lot of ryobi batterys don't last like they should i have had the same problem, but my battery was less than a year old and i took it back and they give me a new one.