Agilent Technologies Blood Glucose Meter AN 372-2 Benutzerhandbuch

2

Increasing demand for portable DC
power has risen from improvements
in battery and motor design technol-
ogy. More than ever before, portable
DC powered products have become
available in many diverse applications.
Rechargeable batteries appear in all
types of products from analytical
electronic equipment to power tools
and toys. In some instances, these
diverse applications pose different
requirements on the source of DC
Power. Fortunately, availability of
many types of battery chemistries
yield unique characteristics. Table 1
contains just some of the different
battery types and their advantages.

Whether testing batteries in R&D or
production environments, the test
requirements for each of the different
battery types are basically the same.
Figure 1 shows a common test config-
uration. In general, the testing of a
battery involves discharging it over 
a period of time to determine several
specifications. This application note
will concentrate on the test of second-
ary batteries because they require
additional tests involving recharging.
Nickel-cadmium batteries, in partic-
ular, are discussed because they are
the most universally used type of 
secondary battery in today’s demand-
ing applications.

1.2

2.0

1.5 to 1

1.5

1.5

1.5

1.4

portable 

standby service,  

memory backup,

average use

good general

button-sized 

button-sized cells

equipment, 

rechargeable

pacemakers,

purpose battery

cells for watches 

for watches and

rechargeable

electronic 

and hearing aids 

hearing aids

door locks, 
emergency 
locator 
transmitters

CC

CV, float charge

N/A

N/A

N/A

N/A

N/A

500+ cycles

200 cycles

N/A

N/A

N/A

N/A

N/A

3 mos. 

1 year

5 to 10+ years

1 to 5 years

5% loss/yr.

6% loss/yr.

4% loss/yr.

(–2%/day)

20°C to 70°C

–20°C to 65°C

–55°C to 75°C

–5°C to 55°C

–30°C to 55°C

–20°C to 55°C

–10°C to 55°C

high discharge 

high capacity

flat discharge,

low cost,

good energy

flat discharge,

flat discharge

rate, quick 

long life, wide

sloping 

density,

more energy 

charge rate

temperature 

discharge, 

sloping 

per unit 

range, good 

low energy

discharge

volume than

energy density

density

mercuric oxide