20" Lawn Mower battery not holding up

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I used my lawn mower last year with no problem. However, this was in mid-July when the grass was more brittle.

I've now been cutting the grass for the last month and a half and I am not happy with the battery life. I had to raise the blade to the highest setting in order to keep the green light on. However, even then, I would get an orange light often. What's the deal with that?

I last cut my grass on Sunday (at the highest setting) and did it again today (Wednesday) on the middle setting. I continued to get an orange light and my battery died after only getting done with my front yard. Last year, I was able to complete the front and most of the back yard in 1 battery life. I had to switch to my smaller weed whacked battery, but that only lasted a few passes too! I then had to wait for the big battery to charge in order to finish the job!

I'm wondering if I'm doing something wrong or if it's just because of the season? Is it because I'm mulching it instead of bagging it? Would it make a difference if I bagged it? Either way, I'm annoyed!!
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Vanessa Saut

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Posted 3 years ago

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Blue Angel, Champion

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Official Response
Vanessa, the most common cause of a decrease in performance is a dull blade.  Have you sharpened your blade recently?  Not only is battery life drastically reduced, but cut quality suffers as well.

Also check that there isn't a buildup of grass clippings under the mower deck, which can also hurt performance.
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David Cline

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Especially on the 20" a dull blade will slow the rotation speed and lead to grass buildup, further slowing the speed and leading to miserably short battery life.

If you haven't sharpened the blade this season, do yourself a favor and buy a second blade. I recommend sharpening before putting the new blade on for best performance, but either way sharpen the other blade between mowings so you have a fresh blade ready to swap in the next time you start having poor performance mid-mow.
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Sid Parish

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I don't think it's nothing to do with a dull blade, try turning light's on and run battery down to zero then recharge
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Jacob

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Dull blade. Always the issue. Cuz its like swinging a baseball bat under water
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(a)Typical Engineer

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Between dull blade, and battery dying; I agree that dull blade is more likely and easy to determine if it was the cause. 

You'll need a power meter to determine if the overall capacity of the battery is declining.

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