Not designed to replace a conventional high amperage charger unit, or to recharge from flat. 3 versions of Battery Savers are available: - The 6 and 12 volt battery saver - The European version (supplied with a 2 prong Euro connection for 220 - 250 volt systems) - And the 24 Volt battery saver (ideal for Lorries and Standby Generators). Our Battery savers are designed with your Classic in Mind! No more flat batteries. Thanks to your requests and suggestions we have been able to develop the new improved battery saver. Incorporating all the latest developments to ensure you have the safest most technically advanced battery maintenance system on your vehicle. The 6 and 12 volt Battery Saver (E171) can be used in the car with the saver permanently connected to your battery terminals, which is perfect if your battery is hard to reach. Or you can use it with the battery removed. The saver lead can be discretely placed for convenience you simply connect to the mains when required. Unused batteries could lose up to 50% of their charge within 2 weeks, if they are allowed to totally discharge they may never charge again. The saver is designed for use on 6 volt and 12 volt lead acid batteries (sealed or unsealed). Full short circuit protection and minimal running costs ensure great value. Read \" How-To Maintain Car Battery Life \" from Technical Articles for some useful tips to keep your car battery stays healthy.