I've not been using the car much lately and had a flat battery this morning, so give the car a good 1 hr and a half run and immediately after it is still reluctant to turn over so need to get the alternator checked out but assuming its the battery where is the best place (cheapest) to get a new one. Also is there any that can be considered an upgrade. Don't think i want a braile battery but is there anything with more current etc?