But in may cases the device becomes &quot;obsolete&quot; because its battery no holds adequate charge and is intentionally <i>not</i> replaceable.<p>For example, that&#x27;s certainly the case with Microsoft Surface Pro [1,2,3,etc.] computers as MS made it clear that the design life of the battery was  about 3 years (and isn&#x27;t user replaceable).  That&#x27;s absurd for a device with an initial cost of &gt;$1500.<p>If the battery lasted 20 times as long, I&#x27;m sure many such devices would be kept in service for much longer than 3 years, for many users there&#x27;s no need to &quot;upgrade&quot; after so short an interval.