how long do they last? got my lads old e-max out today, charged batterys took it out and lasted about 5 mins, they are 3000 nimh but are about 5 years old and prob not been charged for the past 3, also noticed truck was slow, got reedy bad maxx motors in it ( are they still made)? notice now that capacity on new batterys has increased quite a lot from 3000s ive got, as i intend to get savage flux would lipo be ok in e-max but still use bad max motors? or should i just bin the lot and move on? not saying e- max is bad just trucks have moved on since i bought it years ago.