just went outside to go out in my 2008,hasn,t been used in 3 weeks and find the battery dead,really surprised as I dont beleive that I have any phanthom draws,anyhow went to book and doesn, talk abt putting on a battery charger,I would think I would connect it just like I was jumping the van,any disagreements on this?also is it ok to put it on a battery charger?thanks in advance