We have been experimenting with this
BatteryMINDer charger for maintaining batteries in our lab. We have other 2/4/6 amp chargers that use at competition but this charger is cheap and lets you plug in 4 batteries at a time when used with a
spliter. It charges slowly and help recondition batteries. So far we haven't had any problems with this charger.
We buy all our batteries straight from MK. Call them and tell them you are a FIRST time; they have been a great supplier for a long time.