We got a few requests for the source of the 6 amp by 5 independent battery charger we used at the PNW regional this past weekend. This is our second season using this charger. It is a good three stage charger with state of charge indicators. It is is not cheap, about $100 per bank, but the old adage of getting what you pay for applies in this case.
It is available at
www.batteryweb.com, model LS-1206 in five bank form. See the link:
http://www.batteryweb.com/interacter_x5.cfm
put anderson connectors on it and you are kept fully charged. If one bank fails (and none of ours has) the other four keep running on separate fuses. It can keep fresh batteries coming to a robot going all the way through the finals, swapping batteries every match, with enough spare capacity to help out an alliance partner who is running short on batteries.