Innovative technology with no internal battery so no need to wait hours for the unit to charge before use, simple and safe to use with no long term battery storage issues. This power start can be fully energised in approximately 3 minutes. If the vehicle battery is faulty or is holding less than 5 Volts the ElectroStart1224 can be pre-charged via another vehicle\'s 12 or 24V battery and be capable of starting a 24V vehicle even when charged via a 12V battery. Compact and lightweight for easy handling and storage, yet still delivers the same result as heavy, bulky, lead acid battery equivalents, making it ideal for the professional mechanic and DIY users.