I've just bought 8 of these AA's for my transmitter (4 plus 4 spare) They work fine &, so far hold charge well. They easily lasted all day yesterday at our regional meet.
The only thing regarding that AA holder is that it doesn't appear to be available in the UK whereas the batteries are.
I bought one of these:
https://www.modelsport.co.uk/etronix...roducts/376838 but my radio has a removable battery holder to plug this lead into, & then into the charger.