Lipo`s can be very touchy batteries and can be faulty, the charger on the other hand is very stable and reliable, i would say its your lipo`s that are at fault. If you have only had your cx for a week take it back to lhs and get them to swap lipo first, they should if the same happens then that only leaves the charger but i would be suprised if its that though

Mine only takes 45 - 50 mins charge time