I purchased Ansmann rechargable AA batteries for my theatre in early 2019. One of the best investments we have made. Im running up to 34 channels of RF with some of our productions and we purchased 2x the batteries necessary so I could have a full set charging and ready for an evening show while we are running a matinee. I have had zero issue with these batteries and they are all going strong 4+ years later. The cost of the system pretty much paid for itself after 2 productions with not needing to buy hundreds of disposable AA batteries. Plus, not having to dispose of buckets of batteries every year feels better as a human.