I say using oxygen tablets makes all the difference when it comes to maintaining your minnow bucket. Everytime i use them the minnows are very lively. Pick up an extra one for later in the day. The hard part is catching those supercharge babies.
I think there good for over 5 hours, check the package. There where you buy bait. Most shops have them. There popular, I'm telling ya they work wonders. Keep the lid on the bait bucket because them minnows are SUPERCHARGED lol. I'd think they cost less than good batteries. And you don't have to listen to the pump.