https://www.amazon.com/Hitec-RCD-Bal...SIN=B0166KUBC4
cubcrasher the Hitec X-1 above is an excellent full service (meaning it will charge most all current chemistries) and will serve you well. The selection out there is huge. Using a charger such as this will assure you that your 6v 2000 mah packs will give you good rated service as well as allowing them to last longer.
My charging station has two single port high output Venom pro plus a Hitec X4 four port and a two port Thunder Power unit. Also use two basic china four button types that are obsolete.
John