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My 40v 20" Ryobi electric mower - which had previously been one of my favorite purchases started to perform really badly this summer. It would clog constantly, and seemed to be consuming the battery a lot faster. The problem was my ignorance of mowers.
The blade had dulled over three summers, it had some fairly sizable nicks in it and I decided to purchase a replacement for about $28. That did it. It's as good as new. I'll try and repair the old one and use it as a spare, but I need some tools.