With Ultrax leaving the party, you have a choice of Power 4 original, GiFi and a couple of brand x ones, all getting old now and difficult to judge their storage and handling stuck in a warehouse maybe for a long time. In Europe we had late 2018 Power 4 batteries, but they've sold out now and older ones are circulating, there are numerous posts on the forum to convert standard LiPo batteries to fit the H.
If you don't have a 3rd party charger then you'll need one, it will give you an idea on your purchased batteries condition/health, whether you bought a bargain or a load of rubbish.