Funny how a lot of chargers look like my old trusted BC6, nice to have mains & 12 volt input, 5 Amp max output is good enough, a selection of cables, seems to cover most options.
Batteries may need to fit whatever you are racing, you will understand stick & saddle, there may be other options and may be possible to run saddle as stick in the long slot, you need to adjust to battery connectors & balance connectors as well.
Perhaps you should visit a local club/meeting and look around, drivers have time to chat between heats and most are friendly, not practice, heats & three finals then ?
