Bought a pair of these at Tesco, Juice rechargeable lithium AAs. They were on the discount shelf, can't remember how much but about £3 I think.
Best rechargeables I've ever had. They lasted, in all, 22 hrs and 15 minutes from one charge in my DAB personal. So even in the event that I do another 320+km bike ride, they'd last all day even if I had my DAB on the whole time.
Each battery has its own charging port, you just plug USB-C in. Very handy. I do have some other lithium rechargeables but they have their own charger (and discharge quickly after charging even when not being used, these ones discharge very slowly).
(https://i.ibb.co/hJFV9Vf2/aabatts.webp)