510 Automatic Mega Batterys

[McMongo]

I have 2 Auto-510 Mega Batterys that are stamped with "ADVANCE" with a Medical looking symbol and I'm trying to findout who makes or stocks them. They are the best auto 510 I've used and want to buy some more but can't seem to figure out where I purchased them ( I have more batterys than I can count ). If this rings a bell with anybody let me knoow please.

Thank you
David