I'm reading 18.4 volts on + and - terminals on battery itself(before electronics). Where battery connects to tool( after electronics) I'm getting 7.4 volts. Circuit board looks clean nothing burnt or corroded. I'm thinking this is major board problem. Any ideas? Thanks Bob.
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Ryobi 18 volt battery problem
- Thread starter SDBOB1
- Start date
619DioFan
Well-known member
I had this same issue awhile back with a 18v ryobi batt ( I made a post about it ) tested 18v but when installed in tool , nothing. I exhausted my limited diag skills and then junked it. Something in the board is most likely bad , for me I just replaced it as it was over 3 years old.
rslaback
Well-known member
Sounds like board failure to me. I'll take it off your hands if you want.
webscrounger
Well-known member
Don't know how old yours is but I believe the warranty is 3 years.
James-W
Well-known member
I am totally confused, please enlighten me. I have never taken a Ryobi battery pack or a Ryobi cordless tool apart so I have no idea what is inside either one. Are we talking about board failure in the battery pack, or board failure in the tool itself?
619DioFan
Well-known member
There is a small board inside the ryobi battery. in my case the battery read full charge ( 18 plus volts ) put it in the tool , pull the trigger and nothing. I tried said battery in three different tools with the same result. I went so far as to attach jumper leads to the battery then to a tool with my dvom inbetween the two. as soon as pulling the trigger the dvom showed the voltage just disappear. I guessed the board in the batt was bad and scrapped the batt for a new one.I am totally confused, please enlighten me. I have never taken a Ryobi battery pack or a Ryobi cordless tool apart so I have no idea what is inside either one. Are we talking about board failure in the battery pack, or board failure in the tool itself?
Thanks guys. I see I can get 2 new batteries and charger at HD for about $ 70.00. I'll keep because individual cells ck good. Save for another with cell problem. I'm a long time Milwaukee tool guy. When I was self employed that's all we used,110 volt. I'm slowly getting all my yard battery tools Milwaukee. I never had problems really with Milwaukee batteries like Ryobi.
James-W
Well-known member
I have Ridgid cordless tools and I like them very much. One of the reasons I went with the Ridgid brand is because they lifetime warranty not only the tool, but they lifetime warranty the batteries as well. Not too long ago I had a Ridgid battery that would not take a charge. I could have sent it in but there is a place not too far from where I live that is a warranty station for Ridgid tools. I took the battery there, they checked it out and were in agreement, the battery was defunct. Even though I had purchased the tool and battery 9 years ago they just ordered me a new battery at no charge and called me when it was in. Once I had the new battery I called Ridgid and they removed the old battery from their records and added the new battery so I now have a lifetime warranty on the new battery as well.Thanks guys. I see I can get 2 new batteries and charger at HD for about $ 70.00. I'll keep because individual cells ck good. Save for another with cell problem. I'm a long time Milwaukee tool guy. When I was self employed that's all we used,110 volt. I'm slowly getting all my yard battery tools Milwaukee. I never had problems really with Milwaukee batteries like Ryobi.
I am not trying to get you to switch from Milwaukee to Ridgid, just pointing out that Ridgid does have a really nice warranty and it is something to consider when buying cordless tools. As we all know, batteries for cordless tools are not exactly cheap, so having a lifetime battery warranty is a huge plus in my book.
MarvinBerry
Well-known member
If the battery gets run all the way down to zero it can trigger a 'defective' kinda state where they lockup & won't charge/run.
If that happens sometimes you can unlock by putting it in a charger & then in something low draw... like a drill or impact. Hit trigger once or twice back in charger rinse & repeat.
If that happens sometimes you can unlock by putting it in a charger & then in something low draw... like a drill or impact. Hit trigger once or twice back in charger rinse & repeat.
ddawg16
Well-known member
I believe there are 2 versions of that battery. NMH and Li
NMH will show you voltage...but die when there is a load.
Li....if it's done....it's done...there will be no voltage.
I took apart one of my 18v Li batteries....it had standard 18650 cells in it. Their typical voltage is around 3.5 Vdc. So the 18v pack has 5 cells in it. The BMB (battery management board) regulates the current into and out of the pack. When the voltage gets too low, it shuts completely down.
You do NOT want the voltage to drop below 2v. If that happens, the cell is DONE. Nothing you can do to revive it.
Hence....it sounds like you have one of the older NMH packs. Toss it...get one of the newer ones. More capacity...and longer life.
I have 4 of the 4AH packs and 2 of the 2AH packs. I run the dog **** out of them. My mower uses the same batteries. In fact, all of my cordless lawn tools are Ryobi...and use the same batteries.
NMH will show you voltage...but die when there is a load.
Li....if it's done....it's done...there will be no voltage.
I took apart one of my 18v Li batteries....it had standard 18650 cells in it. Their typical voltage is around 3.5 Vdc. So the 18v pack has 5 cells in it. The BMB (battery management board) regulates the current into and out of the pack. When the voltage gets too low, it shuts completely down.
You do NOT want the voltage to drop below 2v. If that happens, the cell is DONE. Nothing you can do to revive it.
Hence....it sounds like you have one of the older NMH packs. Toss it...get one of the newer ones. More capacity...and longer life.
I have 4 of the 4AH packs and 2 of the 2AH packs. I run the dog **** out of them. My mower uses the same batteries. In fact, all of my cordless lawn tools are Ryobi...and use the same batteries.