i run my layout a couple times a week, maybe one train is run and takes an hour. so that comes out to a little over a hundred times a year, with recharging after every run. I changed the batteries a year ago, and they last the whole session, with the battery gauge icon in the top corner showing about half. I've let it go after a run and not recharge, but run again and the battery icon will be down to 1/8 at the end, with full control even then.
Looks to me the HC is very efficient and the batteries should last at least a couple of years with light-moderate use.
what say you?