Table A:
5. Charging in service
1.47 V/cell at +20°C (+68°F) with voltage
compensation:
- 3 mV/°C/cell (-1.7 mV/°F/cell).
For higher charging voltages, consult your local
Saft representative.
Boost charge according to IEC62973-2.
6. Topping-up
Frequency of topping-up must be determined
for each battery. Topping-up shall be performed
after one year in order to determine the ideal
topping-up interval which depends on the
charging voltage and actual use of the battery.
Never let the electrolyte level fall below the
minimum level mark. Use only distilled or
deionized water to top-up.
The topping-up operation must be carried on
charged cells with a rest time of minimum 2
hours.
Batteries not equipped with a water filling
system (typical frequency of topping-up is
every 6 months):
• No electrolyte level measurement is necessary
if you use a Saft cell-topper, which allows the
correct level to be obtained by a simple nozzle
setting (see nozzle lengths in Table A). If a cell-
topper is not available, the electrolyte level
must be measured.
• Insert a transparent glass or plastic tube (alkali
resistant, 5 to 6 mm in diameter) vertically into
the cell vent until it touches the top of the
plates. Close the top end of the tube by
putting a finger on it and remove it from the
cell. The height of the liquid in the tube
indicates the electrolyte level.
Batteries equipped with water filling system
(typical frequency of topping-up is every 12
months):
• Remove transport seals and connect hydraulic
tubing between cells up to a maximum of 50
cells.
• Make sure that the tubes are completely
inserted for a good seal.
• The hydraulic connection of cells must be in
parallel to the electrical connection, in order
to avoid voltage differences of more than 1.2V
between two hydraulically connected cells.
• The hydraulic connection must be horizontal
in order to avoid siphoning.
• The water filling circuit output must not be too
close to electrical equipment, electrical circuit
and metallic structure.
• Water filling circuit input must be connected to
the self-closing inlet.
• After a check after the first year of use, topping-
up can be performed every 6 years (if the
annual average cell temperature is below 30°C
and the battery is used as a back-up battery)
by gravity or using adapted pump with a flow
rate of 0.7 l/min at a relative pressure of 0.3 bar
maximum.
7. Preventive maintenance
Maintenance operations (not including the
topping-up operation):
• Periodic maintenance should be carried out
at least every 5 years. For detailed
maintenance, please refer to the
maintenance manual of the battery.
• Keep the battery clean using only water. Do
not use a wire brush or solvents of any kind.
Vent plugs can be rinsed in clean water.
• Check the torque of all terminal screws. Coat
with DW33 anti-corrosion greasy film all the
terminal nuts and cell connectors.
• Check charger settings. It is very important
that the recommended charging voltage
remains unchanged. High water consumption
of the battery is usually caused by improper
voltage setting of the charger.
8. Electrolyte
Do not change the electrolyte during the life
time of the cells.
9. Environment
To protect the environment all used batteries
must be recycled. Contact your local Saft
representative for information.
Saft
ESS & Mobility
26 quai Charles Pasqua
92300 Levallois-Perret
Tel: +33 1 58 63 16 00
Fax: +33 1 58 63 16 18
www.saftbatteries.com
Doc N° 21876-2-0620
Edition: June 2020
Data in this document is subject to change without notice and
becomes contractual only after written confirmation.
Société anonyme au capital de 31 944 000 €
RCS Nanterre 383 703 873
Published by the ESS & Mobility Communications Department
SMRX Ni-Cd batteries
Cell type
C
5
Ah
(Ah)
0.2 C
5
A
(A)
Electrolyte Reserve
(cm
3
)
Topper nozzle
(mm)
SMRX 75
75
15
185
59
SMRX 90
90
18
285
59
SMRX 110
110
22
280
59
SMRX 125
125
25
335
59
SMRX 140
140
28
335
59
SMRX 160
160
32
415
39
SMRX 190
190
38
410
39
SMRX 220
220
44
465
39
SMRX 260
260
52
550
39
Cell type
Level (mm)
High
Low
SMRX 75 to 140
66
15
SMRX 160 to 260
59
15
