Amazon.com: Synergy Digital Power Tool Battery, Compatible with Makita 4390D Power Tool, (Ni-MH, 9.6V, 1500mAh) Ultra High Capacity, Replacement for Makita 191681-2 Battery : Tools & Home Improvement
Amazon.com: 2 Pack - Replacement for Battery Compatible with Makita 4390D - Replacement for Makita 9.6V Stick Battery (1300mAh NICD) : Tools & Home Improvement
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2 packs 9.6 VOLT 3.0Ah Battery for MAKITA 9000 9001 632007-4 191681-2 9033 9102 | eBay
Makita 4390D Battery - Power Tool Batteries
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Makita 4390D Cordless Reciprocating Saw 9.6 Volt - Newegg.com