LC-X1228P Panasonic - BSG, LC-X1228P Datasheet - Page 17

• Manufacturer Part Number: LC-X1228P
• Description: BATT SEALED LEAD ACID 12V 28AH
• Manufacturer: Panasonic - BSG
• Series: LCr

Specifications of LC-X1228P

• Voltage - Rated: 12V
• Capacity: 28Ah
• Size / Dimension: 6.47" L x 4.92" W x 6.89" H (165mm x 125mm x 175mm)
• Termination Style: Nut/Bolt, M5
• Rechargeability: Yes
• Weight: 25 lbs (11.3kg)
• For Use With: BVW122250003N - BATTERY CHG UNIV 12VDC @ 2.25A271-2390 - BATTERY CHG UNIV 12VDC @ 2.25A271-2386 - BATTERY CHG UNIV 12VDC @ 1.2A271-2385 - BATTERY CHG UNIV 12VDC @ 600MA271-2382 - BATTERY CHG UNIV 12VDC @ 500MA271-2381 - BATTERY CHG UNIV 12VDC @ 500MA271-2380 - BATTERY CHG 120VAC 12VDC @ 500MA271-2378 - BATTERY CHG 120VAC 12VDC @ 300MAPATC-08 - BATT CHARGER 12V 1.5A X 2 UNITPATC-03 - BATTERY CHARGER 12 VOLT 1.5 AMP
• Lead Free Status / RoHS Status: Contains lead / RoHS compliant by exemption
• Other names: LC-X1228; LC-XB1228; LC-XB1228P; LCX1228P; P049

CHARACTERISTICS
Charge characteristics (constant voltage-constant
current charging) of VRLA batteries are exemplified
below.
Example of constant-voltage charge
characteristics by current
In order to fully utilize the characteristics of VRLA
batteries, constant-voltage charging is recom-
mended. For details of charging see page 19.
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.
Discharge current vs. Cut-off voltage
(V/cell)
Charging
Discharging
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
(CA)
0.05
2.5
2.0
0.4
0.3
0.2
0.1
0
~ ~
0
0.1
3
Discharge current (CA)
0.2
0.3
6
Charge time (hours)
(Test condition)
Discharge : 0.05 CA constant-
current discharge
Cut-off voltage; 1.75 V/cell
Charge : 2.45 V/cell
Temperature : 25˚C
0.5
2.30 V/cell
9
1
12
VRLA BATTERIES PAGE 16
2
15
3
10.8
10.4
10.0
9.6
9.2
8.8
8.4
8.0
18
~ ~
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.
Discharge capacity by temperature and by dis-
charge current
120
100
80
60
40
20
-20
0
-10
0
Temperature <˚C>
10
20
AUGUST 2003
30
0.05CA
0.1CA
0.25CA
1CA
40
50