Amazon.co.jp: Makita 18V Battery BL1860B Replaceable Battery Makita 18V 6.0ah with LED Remaining Battery Indicator Compatible with BL1830, BL1840, BL1850, 6,000 mAh Large Capacity, Battery for Power Tools, Set of 2 :
Makita BL1830B2DC18RC Twin LXT 18v 3Ah Li-ion Battery and Charger