Chargers? ( and I'm still new-ish and not sure exactly where to ask)

[Allllllright_already!]

Hi everyone! I come here and read(try to absorb and learn) all the fun options out there...so now I've found a couple that I'd like to try and wonder if anyone has some insight on 420mA charger being pretty much interchangeable with any batt that requires one? I guess ....in simple terms(lol) my kgo came with said charger and in making my mental wish lists, have seen the same specs for chargers listed on batts not included in starter kits...am I good with what I have(so I can spend more and not have 1/2 doz diff chargers with pieces of tape reminding me what they go to)? Thanks good people- have a great monday evening!