Table A:
Cell type
Rated
Charge
capacity current
Ah Amp
MRX 70
70 14
MRX 80
80 16
MRX 90
90 18
MRX 100
100 20
MRX 115
115 23
MRX 130
130 26
MRX 145
145 29
MRX 160
160 32
MRX 180
180 36
MRX 200
200 40
MRX 230
230 46
MRX 260
260 52
MRX 280
280 56
MRX 300
300 60
MRX 350
350 70
MRX 400
400 80
MRX 460
460 92
MRX 520
520
104
For a battery stored for more than
3 months or at T>+30°C, or more than 6
months at T>+20°C, discharge the battery
at 0.2 C
5
A down to an average 1V per cell.
Maintain the battery in open circuit during
8 hours or until the battery temperature is
between 10°C and 30°C.
Charge the battery at 0.2 C
5
A
for 8 hours.
5.2.
The batteries are delivered discharged
Caution: even if the battery is discharged,
there remains a residual charge that may
cause an electric shock.
Charging and discharging should be done at
constant current.
For a battery placed into service immediately
after delivery or after less than one year of
storage:
• Preferred solution: constant current charge;
charge the battery at 0.2 C
5
A for 8 hours.
• Caution: during constant current charging
the battery box must be open.
• Constant voltage charge : 1.55V/cell for 20
hours with the current limited at 0.2 C
5
A.
For a battery stored more than 1 year:
• Charge the battery at 0.2 C
5
A for 8 hours.
• Discharge the battery at 0.2 C
5
A down to an
average 1V per cell.
• Maintain the battery in open circuit during 8
hours or until the battery temperature is
between 10°C and 30°C.
• Charge the battery at 0.2 C
5
A for 8 hours.
The battery is ready for use.
6. 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.
7. Topping-up
Before topping up operation, the water
filling circuit of the battery must be checked
for tightness (no leaks) using a pressure test
(a kit may be supplied by Saft).
Use only distilled and deionized water for
topping-up.
Connect distilled water tank to the self-
closing inlet. Topping-up is completed when
an excess of 1 litre of water is measured at the
outlet of the water filling circuit.
Topping-up can be performed by Saft’s
gravity kit or by using Saft’s water filling
stations.
If charge at constant current: operation must
be carried on charged cells with a rest time of
minimum of 2 hours.
If charge at constant voltage on the train, the
topping-up can be carried out at any time.
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.
8. Preventive maintenance
In addition to the topping-up, a periodic
maintenance shall be carried out up to every
10 years if the annual average cell
temperature is below 30°C and battery is
used as a back-up battery.
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.
Check torque of all terminal screws. Coat
with DW33 anti-corrosion greasy film all
terminal screws and connections.
Check charger settings. It is very important
that the recommended charging voltage
remains unchanged. High water
consumption by the battery is usually
caused by improper voltage setting of the
charger.
It depends on the charging voltage and
actual use of the battery. Refer to section 7
concerning topping-up.
9. Electrolyte
Do not change the electrolyte during the life
time of the cells.
10. 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° 21119-2-0620
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
MRX Ni-Cd batteries
