2-Pack C & D Cell to AA Battery Adapter BT-C2000 BT-C2400

They work, set them to charge at the max, think 1400 mA. It's not actually charging them that fast though, mostly under 1000. Can't do a 3000 mA rapid charge, my charger doesn't charge that fast. You can buy them on eBay. Only charged those two batteries to almost 2000 mAh. Probably had a charge. To lazy to do the discharge & charging. The other two batteries look a little beat up. Or I used the screw driver to remove em, and scratched them.