2022 options for 3DR Iris plus Battery packs

Hello everyone ,
im trying to find any source in the EU for batteies for my good old workHorse Iris !

back in 2016-18 i found the Tattu 5100 10c but i was informed that this model is discontinued .

My batteries are starting to age , and i dont want to replace my iris i have tuned and setup over the years
too well

do you have any recommendations?