I have an ITech ac 40 amp charger and an Enerdrive ac 40 amp charger. Whilst charging up my ITech 120 lithium batteries I find that the chargers (both of them and not used at the same time) will go into float after only delivering about 30 a/h into the batteries. This happens all the time. Cables are 6b&s, so more than capable of handling amperage. Connections are tight and clean. I put the positive directly onto battery and the negative onto the "B" side of the shunt so I can read the amperage going in. This happens on both my single battery and the 2 I have in parallel. Any ideas would be most welcome. Cheers from Oz.