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Along time ago now I worked for a company that manufactured gyros for ships and aircraft. When they started to look at miniturisation they used samll caged bearings capable of 40,000 rpm. These bearings from the manufacturer come already filled with grease and didn't require anything doing to them. The grease doesn't come out because of the cages. Now when they do need servicing what we used to do is weigh the bearing before stripping and cleaning and then when it was reassembled the amount of grease used was weighed to make the bearing the same weight as before. You can over-fill a bearing so if you have purchased new caged bearings do not put in any more grease.
If things don't change... they'll stay as they are!