Can I get the 15" string trimmer with a 5.0Ah battery?

Bought a 56v, 2.5a/h trimmer at Home Depot two days ago and went back today to buy some string. They now have in addition another EGO trimmer, a 58v with a 5a/h for only $30 more. This is not listed on your web site nor Home Depot's. Believe I should return the one I bought and get the new one as the difference between the cost of a 2.5a/h battery and a 5a/h is much greater than $30. I used the trimmer once and it is great. Got about 1hr use on the battery trimming both light and heavy weeds.