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Maybe if I used it like your Mom does, but using it for heavy duty trimming it won't make the grade. Why bother with a second battery when even with one it won't make the grade. My son has a battery powered trimmer and a small lot by comparison, not even the amount of trimming I have in my front yard, and he goes through two batteries each time. He's happy with it, but it sure wouldn't make my day at all. Then there's the cost and disposal problems of batteries to factor in as well. The "environmental" advantages are miniscule at best since you need electricity, carbon based generation, to recharge those lithium based batteries. Yeah, you don't have to pull start them, but if that's what stopping you stay on the couch.
My Kobalt trimmer isn't one of those wimpy 26V 40V or 60V type of trimmer.
It's a 80V trimmer with 2 speed setting. That trimmer will do my whole yard plus my parents' yard before I needed to recharge the battery. We both have fenced in yard and I have owned it for 4 or 5 years now. The 80V battery is still going on it.
And what neat about Kobalt is I also own a 80V self-propelled mower that will do my whole yard on one charge but I would need to recharge it before I can mow a second yard since it self-propelled. I also used the non-self propelled Kobalt mower as well too until i got the self-propelled one.
The 80V on the mower is longer than the 80V on the weed eater but the battery is still interchangeable. It'll just stick out further in the back of the weed eater and it'll probably do 4 or 5 yards on one charge of the mower battery. You can use the weed eater 80V in the mower as well too however it will be half a yard since self-propelled motor will drain it.
I like my mower and I can self propel it to a location in my yard without having the blade enabled. I had my son start mowing for allowance when he's 12 and it's just easy for both of us that he can just grab the mower and battery then start mowing. No oil to check, gas or any type of fluids to deal with.
I can vouch for the 80V Kobalt (not the chainsaw .. stay away from that one) since I had own a push mower and weed eater for over 5 year then I got a self-propelled mower 2 years ago. They are good heavy duty mower and weed eater. I have cut a half a foot tall grasses with it when we were gone on a trip for a month etc and got back home to mow it.