Hi Mike,
..... is there a certain type I should look for and a type to stay away from? Thanks again for the info!!
Any of the rechargable AA cells will work.
In my experience, a "charge" in a rechargable will not last nearly as long as good fresh set of alkaline Energizers - but you're saving by using them over and over.
I'd get two sets (8 batteries) so I could have a freshly charged set on hand.
Also, you should discharge the batteries all the way before recharging to keep them working at maximum capacity.
When I was running four photographers at a newpaper, we pulled the discharged batteries out of the flashes and put them into two cell flashlights which we left on on the top of our desks.
When the penlights put out no light, we put the batteries in the charger.
Vivitar used to market a quick charge battery pack with a dedicated charger that would recharge in less than an hour. It was, even back in the 80s, very expensive unless you using them in a business.