Editing Psion Siena General Maintenance (section)

== Batteries — the Siena's central maintenance issue ==

{| class="wikitable styled-table" style="width:75%; text-align:left;"
|+'''Power'''<ref name="wpsiena" /><ref name="spec">[https://www.psion.netogram.com/psionspecifications.html "Psion specifications"], netogram.com. Source for the Siena's specification including weight, dimensions, memory and expansion arrangement.</ref>
! Item !! Specification
|-
| Main || '''2 × AAA cells'''
|-
| Backup || '''CR1620''' lithium coin cell
|-
| External || '''None.''' There is no socket.
|}

Three things follow from that, and together they make battery discipline more important on a Siena than on any other SIBO machine:

* '''You cannot run it from the mains while you work on it.''' On a Series 3 you can pull the AA cells and keep the machine alive on an adapter. On a Siena you cannot — the backup cell is the only thing holding your data during a change.
* '''AAA cells hold roughly a third of the energy of AAs''', so the Siena is emptying its cells faster than a Series 3 does for the same use.
* '''The backup cell therefore matters more here than anywhere else in the range.''' Replace the CR1620 on a schedule, not on failure.

The cells and the backup cell sit in a compartment '''below a detachable casing in the top of the device'''.<ref name="wpsiena" /> Check the casing clips and the contacts whenever it is off.

'''Remove the AAA cells for storage''' and back up first. A leaked AAA in a machine this small has very little distance to travel before it reaches something important.