© Isothermal Technology
Page 17 of 102
923 milliK manual - issue: 1.10
2.3 Battery Operation
The milliK is primarily intended for use as an AC powered, bench-top instrument and is
supplied with a universal power supply for this purpose. However, it may also be powered
from batteries (not supplied) so that it can be used where an AC electrical supply is not
available.
The battery compartment is located on the rear panel. To gain access, squeeze the tabs on the
sides of the battery draw and slide it out. The battery compartment accepts four AA size cells.
The milliK can use primary (alkaline or lithium) cells or rechargeable (NiMH) cells. Lithium
cells provide the longest battery life (>6 hours), but are expensive and are not rechargeable.
Rechargeable NiMH cells provide good battery life (> 4 hours) and being rechargeable offer
low running costs, they are therefore the recommended solution for users wishing to use
battery powered operation. Alkaline cells can be used, but they provide limited operating life;
tests have shown that alkaline cells offer half the operating life of NiMH cells with the same
quoted capacity (mAh) because they have a higher output impedance during discharge
(leading to a lower output voltage).
