Leisure batteries are not car batteries, they are specially desigined to slowly release their power at a steady rate over several hours ensuring your vital energy requirements such as fridges and lighting are continually supplied. Car batteries won't do that as they are desigined for a big power delivery to start the engine and then be topped back up with charge from the engine.
Sealey has been designing and making hight quality tools for many years, no matter how awkward the access or how complext the job is Sealey have a tool to make the task easier and quicker saving you time and money.