https://alexnld.com/product/bl1890-battery-case-pcb-charging-protection-board-shell-box-for-18v-bl1860-9-0ah-6-0ah-led-li-ion-battery-indicator/?hilite="Upgrade Version BL1850 18V 3.0%2F4.0%2F5.0Ah Rechargeable Lithium Li-ion Battery Power Tool Batteries for Makita BL1840 BL1830 BL1850B LXT 400"