Home Improvement Asked by user133880 on July 17, 2021
I have an Echo CLM-58v cordless electric push lawnmower. It’s worked fine for ~1.5 years, however when I took it out of storage this spring it stopped working. When I start it, it gets a brief burst of power, less than a second, then cuts out completely. The burst of power is enough to get the blade spinning, but it slows to a stop shortly after the power cuts out.
I’ve checked the wiring harness, everything seems intact. I’ve checked the circuitboard that handles voltage regulation and the switches and it looks intact as best I can tell (the housing doesn’t come off so it’s hard to see). I checked the battery and it reports as fully charged and the multimeter says it is at 57.1 volts out of the supposed 58 volts, which seems fine to me. I also checked both the power switches and they have continuity when pressed, so I don’t think it is them cutting out. There is a third safety switch I haven’t tested for continuity, but when it isn’t pressed and I try to start nothing happens.
Has anyone else experienced this issue or have any idea what might be up with it?
I have had 5+ batteries brought to me that show full charge to no charge but do similar or slightly less.
In all of them they had been heavily discharged according to the owners.
All of them had melted a solder joint connecting to the battery pack. I was able to reflow the solder and save the packs in all of the cases.
2 of them showed no charge but it was the same as the others that showed full charge once properly connected they worked fine.
note these were all OEM battery packs and from 2 different manufacturers so it’s not an aftermarket issue. I would check the internal contacts first unless the mower has other troubleshooting guides like an unbalanced blade that shuts down for safety or an excessive current because of built up grass.
Answered by Ed Beal on July 17, 2021
I checked the battery and it reports as fully charged and the multimeter says it is at 57.1 volts out of the supposed 58 volts, which seems fine to me
Is that the voltage checked right after charging? Or did you check the voltage only after attempting to run the tool and it stopped?
I don't know the exact specs for the Echo batteries, but fully-charged 57.1 V for a 58 V battery is not "fine". A fully-charged battery will have higher voltage than nominal. Even after being used briefly, it should. So, it seems likely your battery has failed.
There is a small chance that the tool itself has some kind of fault that's leading to excessive drain on the battery, such as a short. But the fact that it runs briefly suggests that this is probably not the case. It's much more likely that the battery simply cannot hold enough charge to run the motor for any useful amount of time.
Maybe you can fix the battery as the other answer suggests. Though frankly, it's not really clear in that post what electrical connection it is they are actually talking about. A photo should have been provided, or at the very least a more specific description.
The fact is, without having the mower in hand and being able to perform specific diagnostic steps on it, it would not be possible for random people on the Internet to tell you for sure what's wrong.
Answered by Peter Duniho on July 17, 2021
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