I saw a video a guy made that talked about 5 things for under $100. Some I agreed with. When he mentioned the rechargeable battery thing I didn't agree with buying that item. He said he bought it to save on buying batteries constantly. He said he bought it because it was the best on the market.
I just bought a 24 pack of double A batteries for less than $20. Those will last me for a while. I say if you charge a decent price for your services you shouldn't worry about how much batteries cost. He did say those batteries after 10 years will still charge up to 70%. What I do is buy really good brand batteries and after every event take the batteries out the unit and throw them away. When I'm going to use the wireless mics again I put in a set of new batteries and be done.
I just bought a 24 pack of double A batteries for less than $20. Those will last me for a while. I say if you charge a decent price for your services you shouldn't worry about how much batteries cost. He did say those batteries after 10 years will still charge up to 70%. What I do is buy really good brand batteries and after every event take the batteries out the unit and throw them away. When I'm going to use the wireless mics again I put in a set of new batteries and be done.