Editing DECpc 433 General Maintenance (section)

== Clock battery ==
The configuration and clock are kept by a battery that plugs into header J8 on the system board and is stuck with Velcro to a pad inside the front panel.<ref name="sg23" /> DEC's parts list gives it as a 4.5 V battery, part 29-28951-01, and its technical reference as an alkaline battery with a three-year shelf life.<ref name="sg3p" /><ref name="trma" /> On a surviving machine the pack is a Duracell MN1500CCB "Alkaline Computer Clock Battery", 4.5 V 2.45 Ah, labelled with a warning that it may explode or leak if recharged; the chassis metal above it has rusted.<ref name="photo" />

DEC's sources disagree on charging. The service guide says the battery "receives charge current when power is applied", while the technical reference and the battery itself say it is alkaline.<ref name="sg1" /><ref name="trma" /><ref name="photo" /> The pack's own label warns that it may explode or leak if recharged. See [[Battery Explosion, Capacitor or Corrosion Damage]] for cleaning up alkaline leakage and [[Battery Refurbishment]] for building a replacement pack.

DEC's replacement procedure:<ref name="sg23" />
# Record the Setup settings.
# Remove the outside cover, the inner cover and, if fitted, the 2.5-inch hard disk.
# Unplug the battery cable from header J8 and pull the battery off its Velcro pad.
# Fit the new battery to the pad, plug it into J8, and refit the disk and covers.
# Run Setup and enter the configuration again.