We started using these chargers last year after suffering with poor performance from past and present kit chargers, we were loosing them 1 by one.
http://smartercharger.com/products/b...-multi-us-4-3/
Our new battery cart with 6 of those things with all their LED's glowing on the front sure generated a lot of attention at the AZ regional last year.
It's the only charger I will use on small backup generators, and battery backups now too.
We also load tested and purged all of our old and failed batteries and got fresh ones so now we roll with 12 good batteries and 6 good chargers.