I have a 12V 1.2Ah rechargeable lead acid battery. I understand that by 1Ah, I can use the battery to supply 1A current in one hour time. So using this logic, I can use my 12 V 1.2Ah to draw 2.4A from the battery to last half an hour. But how exactly can I do this practically? How do a make my circuit (a boost converter) to draw 2.4A from this supply?