15" Powerload split shaft string trimmer with or without 2.5 battery?

  • 1
  • Question
  • Updated 3 weeks ago
  • In Progress
I've decided to buy the ST1521S 15" Powerload split-shaft string trimmer; now I need to decide if I need to get the 2.5ah battery with it or get it without the battery.  I currently have a 7.5 battery that still has at least a 25% (maybe a little more) after I mow with it, and a 2.5ah battery that came with my blower. 
If I want to buy string trimmer by itself, I think I can use the 7.5 Ah battery with the mower and blower and still have a little battery life to spare, and then use the 2.5 Ah battery I already have with trimmer; I was told by Ego that I should about 40-45 minutes of use with the 2.5 battery on the string trimmer, which should be more than enough for my yard. 
However, the string trimmer with the battery is only $60 more than the trimmer alone ($229 vs. $169), and a stand-alone 2.5 battery by itself is $145 at Home Depot!  Does anyone know if a never-used battery will stay good for several years, and if so, for how long?  I'm wondering if it makes sense to just buy trimmer/battery combo and just store the battery for a few years until I need, but I don't want to wait until then and find out I just have a dead battery.  
Finally, can the plastic guard at the bottom of the trimmer be removed and the trimmer still work?  I'm wanting to use my trimmer to edge, but I think the guard might get in the way of my sight line.  
Photo of dk cromwell

dk cromwell

  • 494 Points 250 badge 2x thumb
  • undecided

Posted 3 weeks ago

  • 1
Photo of Paul Christenson

Paul Christenson

  • 5,022 Points 5k badge 2x thumb
<Finally, can the plastic guard at the bottom of the trimmer be removed and the trimmer still work?  I'm wanting to use my trimmer to edge, but I think the guard might get in the way of my sight line. >

Well, if you operate it without the guard...make sure you use a full face shield...to protect your sight
Photo of Chris

Chris

  • 772 Points 500 badge 2x thumb
I use mine for edging as well, It does impede the sight line. I edge by giving the trimmer a 180 turn. I have never removed the guard. Id be inclined to get the extra battery when there is that much savings versus buying the stand alone. 
(Edited)
Photo of David HD

David HD, Champion

  • 31,256 Points 20k badge 2x thumb
For EGO tools, it's always more "economical" to purchase the whole kit (tool, charger and battery).  This way, you will always have an extra battery as a "backup" in case one of your other batteries malfunctioned.  Thus, I would buy the whole kit for $60 more ... :-)

You mentioned about storing the extra battery for a couple of years.  Keep in mind that all EGO batteries have a 3 Year Limited Warranty from the date of purchase - not the manufactured date listed on the battery.  And if you decided to store it for 2 plus years, then make sure to do the following to ensure long-life of your battery!

For Lithium-Ion battery pack storage longer than 30 days:
  1. Store the Lithium-Ion battery pack where the temperature is below 80°F (26°C) and free of moisture.
  2. Store Lithium-Ion battery packs in a 30%-50% charged condition.
  3. Every six months of storage, fully charge the Lithium-Ion battery pack.
  4. EGO battery pack is equipped with an advanced self-maintenance function. It can maintain 30% of its charge capacity automatically after it is stored over one month.
Lastly, you were thinking of "removing" the plastic guard to enhance your edging capability.  I don't see why this would not work, but you would increase your chances of getting debris hitting your body during trimming and edging.  I am "horrible" when it comes to using the trimmer for edging, so I invested in the Power Head & Edger Attachment for this job.  Good luck with your purchase and let us know which route you decided on ... :-)

(Edited)
Photo of dk cromwell

dk cromwell

  • 494 Points 250 badge 2x thumb
Thanks David!  If I were to keep a new battery in the conditions you describe above, any idea how long it should last, keeping a full or close to full capacity?
Photo of David HD

David HD, Champion

  • 31,256 Points 20k badge 2x thumb
According to Battery University, Li-ion batteries are rated between 300 - 500 charge cycles.  So if you take the average, then you should be around 350 charge cycles.  If you plan to charge your battery every 6 months, then it could last you 175 years without ever using it (not sure if the battery will last that long).  That said; I have a feeling you will be using this battery more often than you originally planned.  Below is a link to a similar question from a year ago, a good read if you have extra time:

How I came up with 175 years (rough math, not scientific by any means):
  • 2 charges per year
  • 350 charge cycles / 2 charges = 175 years

https://community.egopowerplus.com/ego/topics/curious-on-battery-life?topic-reply-list%5Bsettings%5D...

Keep in mind, EGO battery pack is equipped with an advanced self-maintenance function to extend the battery life. Depending on the battery charge, it will automatically perform a self-discharge operation after one month of storage. After this self-maintenance, the battery pack will enter sleep mode and maintain 30% of its charge capacity.

If stored for a month or longer, fully recharge the battery before the next use. It is not necessary to run down the battery pack charge before recharging. The Li-on battery can be charged at any time and will not develop a “memory” when charged after only a partial discharge. Use the power indicator to determine when the battery pack needs to be recharged.

(Edited)
Photo of Steve Ward

Steve Ward

  • 240 Points 100 badge 2x thumb
I would suggest go with the combo with  battery.  A 7.5 ah battery on a trimmer will definately work, but likely will be a bit heavy and out of balance with that much weight at the top end.  I have the powerhead string trimmer and edger with a 5 ah battery. Not too heavy for me to use, but coudl be a bit lighter.  I would expect for most yards a 2.5 ah battery will be more than sufficient to last.  Having the second smaller battery also could be used if pick up a bare tool blower in the future at a good price.