If you are just charging small Rx or Tx packs for nitro then any 6 amp 50 watt charger will do. If you ever run E stuff 1/10 or 1/8 you will want a higher power charger capable of 10-20 amp 200+ watt charges. Protek makes a nice 620 duo charger. I have been using 2 Hyperion duo 615's but they don't seem to be avail anymore. Just remember any high end charger needs a power supply. Make sure you get a power supply that matches your charger output.