I have an Optima red topped battery. When i let it sit for three or four days i always have to boost it. This is the second one i have returned. What could be draining it????

 

There has been a couple times when I shut my trunk lid but the light stayed on for a couple days. Didnt kill the battery but I make sure it shuts all the way now. Id check all the interior lights and make sure none of them are on for starters. If you have a system in it, make sure your remote lead(if you have one) is shutting the amps off. Possibly wire shorting to ground somewhere? That would do it too.