No changes were necessary to the 4 volt Lithium battery or it's charging card. I did swap out the 5000 ma battery with a new 5800 ma battery. The new Lithium battery has a "10 Year Shelf Life" statement printed on it.
I will add a necessary comment at this point, when buying Lithium batteries for your model railroad make sure they are the "Protected" type. Protected means the battery is fused internally to prevent it from exploding if accidentally shorted. I use a fast acting 2 amp fuse in series with each battery, the 2 amp fuse will open fast enough so a short won't blow the internal battery fuse.