DeWalts string trimmer is 40v isn't it? Along with their other recent yard tools.
Lowes was offering a second battery with purchase recently
Yes, their main line of cordless yard tools are 40V. I'm surprised nobody mentioned this until now.
I was looking for a replacement for my 4-cycle Troybilt straight-shaft trimmer (I know, I know... now I know better than to ever buy any of their garbage. GJ didn't educate me in time to avoid that mistake!) My Troybilt was meticulously maintained, and I never ran ethanol fuel in it EVER. I still wound up having problems with it when I tried using it this season, so I finally got fed up and went shopping.
Now, my wife has been wanting to buy a cordless trimmer for years because she can't handle the powerful gas trimmer, but I have always hated the idea of dealing with one. After so many bad experiences with NiCad batteries on power tools and yard tools (including the 18V B&D trimmer that my in-laws have) I hated the idea of walking all the way back to the house from the far end of the property to change out the battery pack. After having a pretty powerful Troybilt (when it would stay running...) I was sure it would be underpowered and I would eventually regret buying it...
I don't.
As you can see, I wound up buying the 40V XR brushless trimmer at Lowe's (the 4.0 Ah battery version). I got the deal on the free second battery they were running. I haven't received the second battery yet (it was a mail-order rebate that DeWalt will ship to me) but to be honest, I haven't needed it!
I have almost 1.5 acres on a very narrow lot that is heavily wooded along the property lines in the back. I have about 320 linear ft of picket fence that I trim from both sides, along with tons of trees, beds, sidewalks and other obstacles. I spend anywhere from 45 minutes to an hour trimming, every time I mow. I have never killed this battery before finishing. Unless I let the yard go a little too long since the last time, it usually shows 2 bars left out of 3 when I start from a full charge. I have done the yard twice on a single charge more than once!
It has a bump feed and will run .095" line like my Troybilt, and has handled everything I've thrown at it so far. It is well balanced and has a high-low switch to help conserve battery life. It still has a variable speed trigger, and I hardly ever need the high setting.
Honestly, the only improvements I can think of would be:
1. Shoulder strap, similar to the Troybilt (pictured). This would be really handy for my wife, who is only just over 5' tall, to help her control this trimmer a little easier.
2. Rotating head for edging, like some other trimmers have. I make due by rotating the entire trimmer, which isn't as awkward once I got used to it. At least I can do it without burning myself or worrying about fluids like I did with gas trimmers.
My neighbor was VERY skeptical of electric trimmers and saw me using my new one. I loaned it to him, and he did his whole yard with it. He wouldn't stop grinning, and he brought one home a week later.
I haven't used any other "modern" electric trimmers, and being a DeWalt guy I guess my opinion is subjective, but take it for what it's worth. I love it.