15" trimmer run time

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I'm only getting 15 min or less total run time on my brand new string trimmer and 2.0 ah battery.
Pretty disappointed in that.
Anyone else getting similar dismal results?  I was lead to believe I'd get 30-45 min out of it full speed, but not even close.  The packaging does not provide an estimate so I do not recall where I read those performance figures but they just are not true for me when running mostly full speed which is what I need to do.
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Nick Basso

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Posted 4 years ago

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Ken, Champion

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I get about half an hour out of mine. Keep in mind, it can take a couple of charge/discharge cycles for lithium-ion batteries to reach their full potential.
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David Cline

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I have only used my 15" trimmer twice since I got it last week, but I'll share my limited experiences:

Today I used my 2Ah battery with the trimmer for 15-20 minutes running near full speed the entire time AFTER using the same battery for just as long in the hedge trimmer and had over 25% charge remaining when I put on the charger.

Last week in its debut performance, after 10-15 minutes running at or near full speed it still had over 50% charge remaining according to the rapid charger. I had planned to try it with my 4Ah battery, but still haven't managed to use a whole 2Ah battery charge up in trimming our entire 6-7k sq. ft. yard.

If you aren't getting more than 15 minutes run time then something must be wrong with your battery, charger, or trimmer. It should all be under warranty if you are the original owner, so I would definitely give customer service a call to diagnose the issue and get some replacement equipment.
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Jack

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Have 2 different 2aH batteries. Get 30 min. +/- consistently with each. Have had my 15" for 4 months.
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Denise C

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Official Response
Hi Nick! Thank you for your post and we are sorry to hear of your shortened run time with your battery. We'd like to troubleshoot with you a little more to try and identify the problem. If you could either send an email to support@egopowerplus.com with your contact number so that one of our EGO specialists can get back to you; -or- give us a call back at 855-346-5656 today and we can troubleshoot further. We are available Monday through Friday 8:30AM-8PM EST and Saturdays and Sundays 10AM-6PM EST. We look forward to hearing from you!
(Edited)
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Jason Mondale

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I got a 15" without the battery.  With the 4aH for 10-15 min runs, the battery goes into the charger with all 4 diodes lit.  I hope to give it more of a workout, but I'm very pleased with the "no battery" option and am very grateful to this blog for learning about it here.
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Nick Basso

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Tried again after a couple of battery recharge cycles...same results.   Just about 12-15 min. run time on full speed.  
Just trimming around the house and a lake front.  So the grass\weeds there is a little thicker but not enough I'd imagine to choke my run time down to half of expectations.  Unless this thing is really only supposed to be for light duty around your flower bed stuff.

I contacted cust service as suggested above  and they are going to send out a replacement battery.
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Jason Mondale

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I should clarify my somewhat garbled note last week.  Because I really am thrilled by the 15".  First HD sold it without battery, $129 (vs $179 vs about $220 with battery).  Then the 4aH battery from the mower fits, is easy to use, and has ample duration for this yard.  Very impressive to others who see it.  And I owe it all to following this blog!
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SCDC, Champion

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Run time?  My phone hasn't been charged this year.


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Blue Angel, Champion

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It took a second to see what you did there... but yes, I agree, a 56V-to-lightning adapter/case would be great!

Unfortunately, the "world's thinnest smart phones" would take on a rather porky form factor, and the "spousal approval factor" would take a dive. :-)
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SCDC, Champion

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You know, with industrial/steam punk thing being hot (as in "Hey man, that's cool") if someone walked around with something that looks alien like that, it would be good fun.  Wonder if the airlines would allow it on a plane.  It would make a good rescue phone if you were stuck on a life boat for weeks.  :/
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Nick Basso

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Just got my sign-in working again here and wanted to post a longer term follow up.

I have a 2nd battery of the same MAH for the trimmer and unfortunately it also does not run any longer than the first battery.  

I still am only getting 15-18 min. max when running at constant full speed .   
Maybe the stated figures are including the down time when people walk around the yard not running the trimmer in between cutting.  But I have enough property line to just pull the trigger and trim nonstop with very few releases of the trigger until the battery dies of course.  
Bottom line, when doing this, the battery only lasts 15-18 min. even in mild temperatures.


I'm hoping now that the batteries are a season older that the run time does not diminish further.
I did notice some of the newest products listed (blower, chainsaw, ) now come with or at least offer a selection for a bigger MAH battery now than last year, so it tells me the company realizes they may not be holding up to the previously stated run times in all cases.

I have to honestly say I love how the trimmer performs with a full battery right up until it dies.  (I also have the chainsaw and love how it performs!...I don't have all day projects though for the chainsaw to test the battery life for it though.)
The trimmer does a near gas powered job IMO, is lighter, quieter and overall works great...I just need it to run longer per charge (without having to pay a lot of money for extra or bigger batteries)...or at least run as long as advertised when I use it fresh full off the charger.  But it does not in my experience.

I want to buy their newer more powerful blower for this spring....but I did not want to have to buy another battery, just the blower...but not sure if it will run very long with my current batteries given their performance in the trimmer.
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SCDC, Champion

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What AH battery are you using?  I only use the 4AH battery, so I'm not sure about the run time on the smaller batteries.  
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Nick Basso

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It is the battery that came with it I believe 2.0 MAH battery. It is supposed to last  30-45 according to the mfg as I understand in the trimmer but it is not even close.
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Blue Angel, Champion

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Nick, how many 2Ah batteries does it take for you to get through one trimming?

You are correct, the 15" string trimmer and a few other tools are now coming with a 2.5Ah battery, but I think this is more about staying ahead of the competition than correcting underperforming tools. I think it's safe to say that you are one of the very few people who would use this tool wide open for the entire battery charge! :-)

Curious, have you tried using the variable speed throttle at all to extend your run time? I realize this might not be an option if your cutting requires full speed, just thought I'd ask.
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Nick Basso

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I agree .. Yes I try to make good use of the throttle when judging the thickness and cut.  I do that w my gas trimmer too, just habit.   I did not mean wide open full time I guess...just running full time but close to FT most of the time.  I have a large lot so I could go through several charges this way if trying to do all the trimming.  No matter what I would run out of battery life...This is more about it just not living up to the mfg spec run times than it is about what battery I have...Sure the 7.5 battery would probably do the whole job but it is very $$ and would be heavy...I just want what to figure out how to get what I purchased to run as long as expected.
I'm very happy with the product overall, other than this.
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Blue Angel, Champion

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Nick, I re-read your original post and you state:

"I was lead to believe I'd get 30-45 min out of it full speed, but not even close.  The packaging does not provide an estimate so I do not recall where I read those performance figures..."

I remember seeing a 30 minute run time estimate when the tool was released, and people were confused as to why the newer brushless model was rated at less run time than the non-brushless model.  Turns out it was because the 15" cut path takes much more power even when the trimmer is just free spinning.

I looked through the the 15" trimmer manual and couldn't find any reference to run time.  I checked out Home Depot's site and found the original model with the 2Ah battery (ST1501-S) still has the original promotional video posted.  Lo and behold, you're not crazy!  The video states "up to 45 min run time" at 0:24:

http://www.homedepot.com/p/EGO-15-in-56-Volt-Lithium-Ion-Cordless-Brushless-String-Trimmer-ST1501-S/...

Those are everyone's favorite words, "up to".  Usually seen in minute, un-contrasting font, right above the 3-foot tall "70% off EVERYTHING" sign.  :-)

As we know, everyone uses things differently.  That 45 min run time would probably be for intermittent use and/or at less than full power.  Consider how Ego is now rating run time on the new 21" mowers... from the 21" mower manual:


Look at the run times for the 5Ah battery; anywhere from 20-45 min depending on use.  That's a HUGE spread, and I based on what we've seen with the original 20" mower I can't imagine any more than a very small group of people who would fit into the 20 min end of the scale.  But, there will be a select few who have exceptionally thick grass that's cut extremely short in the early morning dew who manage to drain the battery that quick.

It would seem to me that usage of a string trimmer could vary user-to-user even more than with a mower, and in that case Ego may have chosen to simply stop trying to promise a certain run time.  Just too much variability?

How many Ego batteries do you have now?  I see you mention you have a second battery for the trimmer, is that the replacement Ego sent?
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Nick Basso

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yes that was the replacement, which was very nice of them to do.  So I have the two total as they said the new battery should have a better run time, but unfortunately it did not.   They said to keep the old one though so the total run time then "adds up" but was still left not understanding why the stated run time was so far off...The rep implied it could be a battery issue or a trimmer motor issue itself but wanted to start w the battery.

Glad to hear I'm not crazy!

Thanks for looking that up...Not sure if they'd want to take back  my trimmer for inspection or not or if they want to re-evaluate the possible stated run time from 45 down to 15...:-(
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Blue Angel, Champion

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I found this on a European website for the 15" trimmer:



Looks like they rate it at 25 min with the same warning about variable run time.

I would have to say as far as the general satisfaction of the product goes, Ego seems to have kept the vast majority of their customers happy. The reviews on the Home Depot product page for the 15" 2Ah kit are overwhelmingly positive:



As you mentioned, it is possible there is something wrong with your trimmer. However, if you have been using it for a while and are satisfied with its power and performance, having a defective tool is less likely... I would think a defective tool would fail in short order?

You could always give Customer Service a shout and see if there are any other troubleshooting steps you can take.
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Michael Ross

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The video states "up to 45 min run time" at 0:24:
Purchased 5/2/2019 String Trimmer with 2.5 Ah battery. I am averaging 15 to 18 minutes total run-time in normal weed trimming mode as if using a two-stroke gas engine.
I like the machine but EGO is not up front with actual run-time.  They better start listening.  I need bigger and more batteries but then I am into the backpack.  Does the the professional model last as long as they state? I will look into that next.
(Edited)
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Oregon Mike, Champion

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Perhaps the phrase "depending on battery used" would make the 45 minutes run time more accurate. But, since it says "up to" it could be inferred that is being accomplished with a bigger battery than the 2.5 ah.