My wireless flight deck requires replacement of one of the two batteries at leaset a few times per year, whereas my wired cycle computer batteries I replace only about once every five years. Now this is no problem, if you catch it soon enough when the "low battery" light is flashing, because all it costs is a couple bucks. But if you wiat too long to change, your computer loses all the data, and it requires reprograming all info again. (I hate when that happens).