https://alexnld.com/product/18v-li-ion-replacement-battery-6-0ah-6000mah-rechargeable-power-tool-battery-for-ryobi-p108/?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"