Battery powered weed wacker/trimmer suggestions (bought Ryobi 18V lithium)

[Daox]

Last night was the first time doing lawn work this year. While my wife cut the lawn, I struggled with the gas powered weed wacker that was donated to me last fall. It just wouldn't run good no matter what. Anyway, I'd like to look into electric replacements. The yard is too large for a corded unit, so that leaves battery powered units. Is anyone here using one they could recommend? A lot of online reviews say they don't have enough power, but who knows what these people are trying to cut through either.