Hey Corey
I travel alot for my job and I've been using this feeder from J&L it works great for me;
http://www.jlaquatics.com/cgi-bin/sh...logno=fd-rlgff
It's not the cheapest thing but it gives you the best control over how much you are feeding.
I've found that using the tumble feeders I was either feeding to little or way too much.
One trick I use is to put one of those feeding stations below the feeder to prevent the food from get getting swept away and down the over flows.
http://www.jlaquatics.com/cgi-bin/sh...alogno=fd-ofs2
I realise that it's not battery operated but really if your power goes out when your not there providing your fish with food is a little low on the priority list.
That's my 2 cents
But let's face the facts if you are able to have someone come over and feed your fish that's your best bet.
Thanks,
Trev