I'm after some advice about a jump starter pack, which is the best, or preffered type. Ive had a look at lithium ion type and the old conventional type. The lithium ion types are a lot smaller and apparently only need charging every 3 months or so if not used, also can be charged in the in the car on the go. Apparently good for maybe 3 or so jumps b4 having to recharge. Not so long leads though. What does everybody else have and are these new lithium ion things better or worse? Cheers Andy.