ACTIVE ENERGY 20/40V BATTERY TO FERREX 18-20V TOOLS ADAPTER - BY 3DOMINION
ACTIV ENERGY Li-Ion Battery 20/40 Volt 5.0 Ah/2.5 Ah 90 Wh for Ferrex Cordless Tools
Amazon.com: Rocivic Replace for Makita 40V Battery BL4025 2500mAh, Compatible with Makita 40 Volt max XGT Cordless Tools and 40 Volt Battery Charger : Tools & Home Improvement