AOYAN USB + LED 18V 3.0ah Battery for Makita Cordless tools 18Volt BL1830 3.0ah Lithium Ion Battery Bl1840 Bl1850 Bl1860 Lxt-400 with LED Voltage Display and USB Power Bank Function 18V, 3.0ah, replacement for Makita BL1830 Add a voltage display and power bank function can charge 3.6v ~ 5v things All item Real Capacity, Built In With High Quality Grade A 18650 cells for BL1830 3.0ah Built-in shock absorbing features protect the battery for Makita 18V Drill 1 year warranty and 30 days free return. If have any problem,Please contact us freely