I use only one charger to handle A-123, nimh, nicad, lead acid, or other lithium types. If you need several chargers to handle your batteries you've selected the wrong charger.

Not being arguementative but I've found that I obtain more than enough time on a single 2,000 ma AA nimh than I can use in a days flying with a 100 cc twin. So there's no need to re-charge an ignition battery at the field. If it's a multi day event I just do the charge at the end of the flying day. It's a rare day when I even have a need to re-charge the A-123's at the field. I get in 5 good flights before considering a charge, and that point still has a couple of flights remaining on the flight batts. I typically fly only 50 and 100cc sized planes so my stuff doesn't have much in the line of weight constraints. Others may have a different situation to deal with.