Can someone explain the difference in a sealed and a gel battery? My battery in my '84 R65 bit the Big One, and I have to purchase a replacement. The parts people at my local BMW dealer said if I decide to buy a gel battery that I have to buy a gel charger as well. Is this true? I have a battery charger right now and it does the trick, even if it is kind of old. Someone suggested a Panasonic sealed battery that runs about $60 or so. The BMW dealer wants $82 for a regular one you have to add distilled water to, so I don't think I'll go that route again. Any suggestions? Thanks!