My 12 Volt battery keeps on going dead in my almost 2 year old Kona. Seems it doesn't like the cold. An hour after getting back from a one hour drive which I had to get a boost to start, it was down to 4.5 volts. Hopefully I shouldn't have a problem getting it warrantied. For those that have replaced the F45 battery with something else what battery did you put in and was it an exact fit.