Afternoon everyone, A few months ago I bought a low mileage D300S that’s in quite good condition. It came with a battery grip that at first didn’t seem to want to communicate with either of my 300’s. It sat for quite a while and today I had some time to tinker with it. With the grip in place and an EL3e battery it worked just fine with none of the apparent problems it had shown. This grip came with an EL4 battery that apparently needs a charge. It looks like the battery in the grip is used instead of the battery located in the body. I haven’t downloaded a manual but this camera has been otherwise pretty intuitive. I am unsure why the on-board battery isn’t used if the grip battery is low on power but that seems to be the case. Is there a reason for this? What charger should I use for the EL4? Rick H.