The servo motors are usually powered by batteries. This power source is then regulated to 5V (using voltage regulator). Amount of voltage depends on applications needed. 5V voltage is enough to drive torque to perform useful motions. Commonly, servo motors are powered by smaller batteries like Nickel Cadmium ('NiCd') or Nickel-Metal Hydride ('NiMh') or even the latest; Lithium Polymer ('LiPo').
That said before you buy the batteries it is better to know what kind of battery is suited for the equipment that you have. Generally all the manufactures include this advice on the equipment itself. CR2032 lithium batteries are also such batteries which are used in a lot of equipments. The other most common type of batteries is the alkaline batteries and the nickel cadmium batteries.
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You are storing Nickel Cadmium (NiCd) or Nickel-Metal Hydrate (NiMH) power cells. These will lose some of their capacity every day if not stored in the refrigerator or environments at 70 degree room temperature. If you can keep them where it's cooler than that, you may not have a problem.
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There is also a lot of misinformation about batteries in general based on the older models and technology. You do not need to totally drain the new lithium models. Its fine to use it until you get a warning of low power but don't purposely try to push it to empty since there is no reason to do so now. And if you do push it to absolute no power you might also experience some lose of data, a very good reason not to go that route.
If the battery runs out, you should dispose of it and buy a new one. When disposing of a battery, you should remember that do not place it in fire or heat it. Besides, do not store used batteries together or mix old and new batteries together because they might ignite. However, taking the electric bicycle battery to a recycling center as soon as possible is considered as the best way to dispose of a battery.