I run Fantom, SMC, and Protek batteries without any problems. The best way to charge them is whatever you can get away with, more amps. Banning that, run the same battery every heat. Don't swap batteries in your cars. They'll get faster as the day goes on.
Charger:
http://www.progressiverc.com/fma-dual-powerlab-8x2.html
Power supply (Indoors):
http://www.fantomracing.com/proddeta...?prod=FAN28596
Power supply (outdoors, 2):
https://www.napaonline.com/napa/en/p/NBE7236/