Spirit-Ca

Last train show I came unprepared and didn't have AAA batteries, I used instead 8881 battery box (that use 6 AA batteries) The train managed to run on the same 6 normal Duracell batteries for 2 days (75% of the time each day) Has anyone used the big battery box 8881 with PF trains? if so what are your thoughts about it? I kinda liked how well the train lasted and I am considering keeping this setup.