Managing Your Purchase Decision

  • 2
  • Idea
  • Updated 3 years ago
I bought the LM2101 mower, the 480cfm blower and 15" trimmer. The mower comes with a 5AH battery and charger. I bought the other two without batteries then also purchased a spare 5AH battery. Using this combination, the trimmer and blower time are about 45-50 minutes. I leave one battery in the charger, mow then use the freshly charged battery for trimming and blowing. I still have above 15% charge after the last two steps. The trimmer and blower are a bit heavier, but I wanted to get the best runtime while having a second battery for the mower.
Photo of craig pierce

craig pierce

  • 170 Points 100 badge 2x thumb
  • confident with my purchase decision

Posted 4 years ago

  • 2
Photo of SCDC

SCDC, Champion

  • 54,608 Points 50k badge 2x thumb
Official Response

Hi Craig,

I believe that's how most of us have to manage our batteries.  I burn through about 75% of a 4AH battery with the blower and weed eater before starting to cut my grass.  This is about how my battery management goes:

  • Start with 2 charged 4AH Batteries

  • Weed Whacker:  25% of a 4AH battery used.

  • Blow leaves and debris onto lawn from beds for cutting 50% of a 4AH Battery used.

  • 4AH battery now has about 25% left so I throw it in the charger.

  • Grab other 4AH battery and cut lawn.  Get about 75% done and 4AH battery depleted. 

  • Pull freshly charged 4AH battery from charger and finish lawn.

So it does take about 8AH's to do my lawn  :)

Photo of craig pierce

craig pierce

  • 170 Points 100 badge 2x thumb
Actually, I calculated out the AH requirement before purchase and just about got the result you posted! I noted I would need to swap out once while mowing with the 4AH, which is why I settled on the 5AH. Nice to know I didn't fat-finger that math exercise. 15% depth of discharge on a regular basis is a bit rough on the battery. Ego uses that to advertise higher run times. I never see red and the charger indicates I'm running about 25% depth of discharge, much easier on the battery.
Photo of SCDC

SCDC, Champion

  • 54,608 Points 50k badge 2x thumb
Unfortunately I do get to the red light while using the mower.  But I don't run it down.  I switch at that point.  My batteries are stored and charged indoors where I keep the house at a cool 70 degrees.  Hopefully this helps a little.
Photo of craig pierce

craig pierce

  • 170 Points 100 badge 2x thumb
Temp is a big knob, so that is wise. These lithium batteries use a carbon conductor technology to conduct the charge. You have to watch out for carbon tracking or hot spots being developed on the film. This happens because it's very difficult to get 100% charge density across all of the film. Heat creates a migration path for carbon to collect to, making the track worse. This is without a doubt the overwhelming cause of battery pack failures people experience with these devices and laptops. It is good to run the battery to the stopping point about every ten charges or so. Most people kill their laptop batteries because they leave it on the charger, which creates carbon density changes as well. These cells are essentially, laptop batteries, just a bit bigger. The Tesla Roadster also use this type of cell. About 3750 of them!!
Photo of Blue Angel

Blue Angel, Champion

  • 179,968 Points 100k badge 2x thumb
Craig, absolutely, heat is the enemy! After researching battery powered mowers I settled on the Ego because of the impressive thermal management Engineered into the battery and charger system.

If you're interested, search YouTube for "Ego vs Echo", there's a guy who does some tear down and charging comparison videos of the Ego and Echo battery platforms. Spoiler: Ego is far superior in its design. :-)
Photo of Jeff L

Jeff L

  • 2,884 Points 2k badge 2x thumb
My lawn is 5700 sq ft of grass.  From a full charge i can mow 3 times and have some charge left, about 10 min. till the red light comes on, which on my battery it says beer time.  By the time I finish my beer, there is enough charge to finish the job. I do not recharge the battery until I am ready to mow again.  However, I only charge until the 100% light comes on and flashes a couple of minutes,  I remove the battery, let it sit about an hour and put into my beer fridge, 45 deg.  When I am ready to mow, I set the battery out while I use my  string trimmer, 15 min?...Again  I let it sit and return it to the fridge.  After two mows I recharge the battery till the 100% light starts to blink, so on and son.  In a nut shell, I charge to about 80%, mow twice, ( red light never comes on), then recharge for another two mows.