resources for a user to make an emergency call send an emergency text message or the like this allows a user to make an emergency use of the device 100 even when discretionary availability of the battery resources has been exhausted in some embodiments this preallocation of a portion of battery resources may be tied to a particular emergency function of the device such as where the emergency function can only be used to call a preprogrammed emergency number e g u201c 911 u201d ensuring that the emergency allocation is not subject to misuse it provides an example of a more general class of embodiments discussed below in which the device 100 is configured to use both static and dynamic allocations of battery resources in addition to the emergency allocation the battery depicted at the top of fig5 a is in a state where portions of the battery resources have already been allocated to subsystems x 1 and x 2 identified by reference numbers 508 and 512 the remainder 520 of the fully charged battery is at this point not allocated to any particular subsystem allocation 510 which includes allocations to both subsystems x 2 and x 3 results from the determinations made at block 412 and 416 of fig4 in this example the needed allocation is well within the available resources of the battery thus when the dynamic allocation is made at block 420 of fig4 the configuration.