Powerextra 4 Pack 18v 4500mAh Brand New Replacement Lithium-Ion Rechargeable Battery for Makita 194205-3 LXT-400 BL1830 BL1815 BL1835 The only Authorized Dealer of the enhanced version of Makita 1830 battery in Amazon Higher capacity (4500mAh), one third thicker cell ! ! ! Charging Technology Controls current, voltage & temperature to maximize battery life Charging at any time will have no effect on the battery,made with high quality LG 18650 Cells Package includes four batteries