Your ego battery is fine for trying out systems, attys, cartos of most any kind. LR are not recommended, but anything at or above 2.0 ohms work just fine. I've used adapters for 401, 801, 901 attys and 808 cartos, smart carts, ego mega atty & cartos on my ego batteries. Found most were
different than reviewed and / or advertised
for me, but like juice, I found what I liked.