BACtrack S80 Specifiche Scaricare il pdf (Pagina 67)

Battery

Type

Cost

Size (inches)

Lead

Times

Performance

Voltage

output

Recharge

Cycles

Alkaline

$12

Size of standard

<1 Week

Poor; limited

recharge,

inconsistent

performance

over lifespan

Very low

Nickel

Cadmium

$10.50

5.2 x 1.7 x 0.87

<1 Week

Good

Many

cycles

Nickel

Metal

Hydride

$20

3.38" x 2" x

0.57"

<1 Week

Good

Fewer

cycles

than NiCd

Lithium

Ion

$20

3.54x1.97x0.394

<1 Week

Good

7.4V

Limited

Lead Acid

$20

3x2x1

<1 Week

High discharge

acceptable

Limited

Zinc

Nickel

$15 for

four (4)

Size of standard

<1 Week

Excellent for

high discharge

1.6V

(single)

High, if

charged

correctly

Table 2.11.7-1: Comparison of batteries

2.12 Charging Circuit

Since a rechargeable battery will be used in the portable unit for power away

from the base unit, there must be a method of recharging the battery. There are

several options available for such a task. However, the unique considerations of

the portable unit and project as a whole will require an examination of various

charging solutions to choose the optimal solution for this project.

While rechargeable batteries have many unique properties themselves with

respect to aspects such as number of recharge cycles, capacity, safety, size, and

many other criteria, their unique charging needs can also be exhaustive. Each

battery requires its own method of charging, and has various tolerances to such

general events as insufficient power, too much power, high temperature, and

other power events.

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