The Oxford EL570 Oximiser 900 Battery Charger is packed with features... Specifications include: 6 Stage battery management system Suitable for 12V battery types up to 30Ah including Gel, MF and Acid batteries Heavily discharged batteries as low as 4.1V can be charged if the battery is not damage Checks the battery leads have been connected correctly Assesses battery & detemerines best charging method Charges at a fast rate to bring the battery to approximately 85% capacity Lowers the charge rate & gives a topping charge to ensure the battery is charged to 100% Hourly voltage checks assess battery health Applies an appropriate charge if voltage drops outside acceptable limits to ensure the battery voltage and condition remains perfect PLEASE NOTE: Do not use on Lithium batteries.