Panasonic Valve Regulated Lead Acid Batteries 12V3.4A LC-R123R4PG Manual De Usuario

This information is generally descriptive only and is not intended to make or imply any representation, guarantee or warranty with respect to any cells and batteries. Cell and battery designs/specifications are subject to
modification without notice. Contact Panasonic for the latest information.

•

Charge characteristics (constant voltage-constant
current charging) of VRLA batteries are exemplified
below.

In order to fully utilize the characteristics of VRLA
batteries, constant-voltage charging is recom-
mended. For details of charging see page 20.

•••••

a) Discharge current and discharge cut-off
voltage Recommended cut-off voltages for 6V and
12V batteries consistent with discharge rates are
given in the figure below. With smaller discharge
currents, the active materials in the battery work
effectively, therefore discharge cut-off voltages are
set to the higher side for controlling overdischarge.
For larger discharge currents, on the contrary, cut-off
voltages are set to the lower side.
(Note) Discharge cut-off voltages given are recom-
mended values.

b) Discharge temperature
(1) Control the ambient temperature during dis-
charge within the range from 5°F-122°F (-15°C to
50°C) for the reason described below.

(2) Batteries operate on electrochemical reaction
which converts chemical energy to electric energy.
The electrochemical reaction is reduced as the
temperature lowers, thus, available discharge capac-
ity is greatly reduced at temperatures as low as -5°F
(-15°C). For the high temperature side, on the other
hand, the discharge temperature should not exceed
122°F (50°C) in order to prevent deformation of resin
materials which house the battery or deterioration of
service life.

c) Effect of temperature on discharge charac-
teristics
Available discharge capacity of the battery varies with
ambient temperature and discharge current as
shown in the figure below.

(Test condition)
Discharge : 0.05 CA constant-
current discharge
Cut-off voltage; 1.75 V/cell
Charge : 2.45 V/cell
              2.30 V/cell
Temperature : 25˚C

0               3                6               9               12              15             18

2.5

2.0

0.4

0.3

0.2

0.1

0

Current

V

oltage

Charge time (hours)

(CA)

(V/cell)

~

~

~

~

120

100

80

60

40

20

0

 -20            -10              0             10             20              30            40             50

Capacity (%)

Temperature <˚C>

0.05CA

0.1CA

0.25CA

1CA

Discharge current (CA)

Discharge cut-off v

oltage (12V batter

y)

Discharge cut-off v

oltage (6V batter

y)

5.4

5.2

5.0

4.8

4.6

4.4

4.2

4.0

10.8

10.4

10.0

9.6

9.2

8.8

8.4

8.0

0.05           0.1            0.2    0.3        0.5             1              2        3