Battery Adapter For Makita 18V to for Makita G series BL 1815G,BL 1813G Tool AO | eBay
14.4V/18V Battery for Makita G-Series BL1813G BL1815G BL1840G BL1413G BL1440G US | eBay
Synergy Digital Power Tool Battery, Compatible with KOBALT K18LD-26A Power Tool, (Li-ion, 18V, 2500mAh) Ultra High Capacity, Replacement for KOBALT K18-LBS23A Battery