Data Sheet
Publication No. EN-NP/NPX-RS-003 -  March 2014 - Subject to revisions without prior notice. E.&O.E.
www.enersys.com
Contact:
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EnerSys and its aff liates.
Testing conditions: Floating Voltage: 2.25 to 2.30V/Cell
   Ambient Temperature: 20ºC to 22ºC
Life (Year)
(AH%)
Percentage of capacity available
120
100
80
60
40
20
0
123455.5
1246810 40 60 246810 20
Discharge Time
13.0
12.0
11.0
10.0
9.0
8.0
(V)
12V
Battery
(V)
6V
Battery
6.5
6.0
5.5
5.0
4.5
4.0
Terminal Voltage
2C
3C
1C
0.6C
0.4C
0.2C
0.1C
0.05C
NP TEMPERATURE 25ºC 
min
h
20
0.1
0.08
0.04
0.02
0
0.06
7.00
6.50
6.00
5.50
0
(V)
14.0
13.0
12.0
11.0
(xC)
(V)
Charging
Current
Charge Voltage
for 6V Battery
Charge voltage
for 12V battery
Voltage Charge
After 100% Discharge
After 50% Discharge
Charging Current
Charging Time (Hours)
0510 15 20 25 30 35 40
0.1C-6.90V (13.8V) Constant Voltage Charging at 25ºC
Testing conditions: Discharge Current: 0.17C Amp.
   Charging Current: 0.09C Amp.
   Charging Volume: 125% of Discharged Capacity
   Ambient Temperature: 20ºC
(AH%)
Percentage of capacity available
120
100
80
60
40
20
0
200 400 600 800 1000 1200 1400
Number of Cycles
100% D.O.D.
50% D.O.D.
30% Depth of Discharge
Charging Characteristics
Cycle service life in relation to depth of discharge NP series
Float service life NP series
Discharge characteristics curves at 25ºC NP series
If discharge currents in excess of 3C are required,
consult the EnerSys Technical Department prior to use.
EnerSys
World Headquarters
2366 Bernville Road
Reading, PA 19605
USA
Tel: +1 610 208 1991
+1 800 538 3627
Fax: +1 610 372 8613
EnerSys Asia
152 Beach Road 
Gateway East Building
Level 11-03 
189721 Singapore 
Tel: +65 6508 1780 
EnerSys EMEA
EH Europe GmbH 
Löwenstrasse 32 
8001 Zürich
Switzerland 
0 2.340 2.510
10 2.310 2.480
20 2.280 2.450
25 2.265 2.435
30 2.250 2.420
35 2.235 2.405
40 2.220 2.390
* Minimum current 5% C
20
no max current limit
** Max current limit 25% C
20
Temperature ºC Standby use*
Float voltage Cyclic use* *
range per cell Volts per cell
Charging Voltage




